Competitor Review by ACIS

MyIQ IQ Test Review: Evidence Before Payment

MyIQ offers a 40 question online test and a low initial trial, but the buyer decision includes an automatically renewing subscription. This review separates the product experience, billing terms and score evidence before comparing the result with ACIS Full.

MyIQ IQ test review scorecard covering accuracy, price, subscription and report value
MyIQ reviewed as a test, a report and a recurring consumer purchase rather than as one isolated score screen.

0 The Short Version

MyIQ is a consumer entertainment product wrapped around a recurring subscription, and the single most useful thing a buyer can know before starting is that the charge repeats every 28 days rather than every month. The test itself is not the weak part of the offer. Forty items of rising difficulty, six answer options each, is a longer and better structured sequence than the ten question quizzes that dominate free IQ search results, and that deserves saying out loud before anything critical follows.

What the product does not publish is the machinery that would let you interpret the score it sells you. As of August 2026 we could not locate a technical manual, a described norm sample, reliability coefficients, a standard error of measurement, or any statement of which cognitive abilities the forty items are meant to sample. MyIQ itself resolves this cleanly in its own terms: the service is offered "for educational entertainment only" and is described as not equivalent to a clinical assessment. That sentence, written by the provider itself, is the fairest one line summary of the product you will read anywhere, including on this page.

So the buying decision is not really about accuracy. It is about whether $29.99 charged every 28 days, for as long as you forget to cancel, is a price you want to pay for a score with no published interpretation attached. This page walks through the published terms, the published privacy practices, the published refund rules, and the psychometric questions the provider has not answered, all dated to August 2026 and all linked so you can check them yourself in about ten minutes.

Who wrote this and why that matters This review was written by the team behind ACIS, which sells a competing assessment. Read it as an informed competitor's evaluation, not a neutral third party audit. Everything below is checkable: we describe only what MyIQ publishes on its own public pages, we date every price, and we link the source so you can verify each claim without trusting us. Where we could not confirm something, we say we could not confirm it rather than filling the gap with a guess.

1 What the Test Actually Consists Of

Start with the concrete. As of August 2026, the MyIQ start page describes the assessment as "40 questions with growing difficulty" and instructs the taker to "select the right answer out of the 6 options." The MyIQ homepage gives the expected duration as roughly 15 minutes and notes that you can skip questions and return to them before submitting. There is no stated hard time limit on the item sequence itself.

Those numbers imply a working pace of about twenty two seconds per item on average. That is fast, though not unreasonably so for multiple choice reasoning items, and the ability to defer a hard item and come back to it is a genuinely sensible design choice that many free quizzes do not offer. It reduces the chance that one confusing early item derails the rest of the sequence.

Two things the public pages do not tell you. First, what the items measure. There is no published breakdown of how many items target inductive pattern completion, quantitative reasoning, verbal knowledge, spatial rotation or anything else, and no statement that the battery is designed to sample distinct abilities at all. Second, whether the sequence is adaptive. "Growing difficulty" describes a fixed increasing order, which is a different thing from item response theory adaptive branching, and the pages we read do not claim adaptivity.

One caution on the item count. Published descriptions of MyIQ vary across sources: the provider's own pages stated 40 questions when we loaded them in August 2026, while some third party writeups describe different lengths and completion times. Products get revised. Treat the live start page as the authority on the day you take it, not any article about it, this one included.

Related framework: what an IQ test actually measures.

2 What a Longer Item Sequence Buys, and What It Does Not

Item count is the one dimension on which MyIQ clearly beats its nearest competitors, so it is worth being precise about the size of that advantage rather than waving at it.

Length buys reliability. Every item is a noisy observation of the underlying ability, and averaging more observations shrinks the noise. The Spearman Brown relationship makes this concrete: if a 10 item quiz achieved an internal consistency of about .60, quadrupling its length to 40 comparable items would push that toward the .85 range. In score terms, that is the difference between a result that could plausibly wander fifteen points on a retest and one that wanders closer to eight. Nothing exotic is happening here, just arithmetic on measurement error, and it favors MyIQ over the three minute quizzes it sits beside in search results.

Length does not buy breadth. Forty items of one general kind measure one thing forty times, with good precision and no coverage. This is the distinction that separates a screener from a battery: a professional instrument reports separate index scores because verbal comprehension, fluid reasoning, visual spatial processing, working memory, processing speed and quantitative reasoning are correlated but genuinely distinct, and a person can sit at the eightieth percentile on one and the fortieth on another. Collapsing that structure into a single number discards the most decision relevant part of a cognitive profile: the shape.

Length also does not buy meaning. A precise measurement on an unnormed scale is a precise measurement of nothing in particular. You can measure something forty times with beautiful consistency and still have no idea what the resulting number corresponds to in the population, which is exactly the position a MyIQ score leaves you in. Precision without norms is the psychometric equivalent of a very accurate ruler with no units printed on it, and the next two sections are about those missing units.

3 The Score, the Scale, and a Counter Worth Noticing

The modern convention for reporting IQ is a deviation scale with a mean of 100 and a standard deviation of 15. On that scale 115 is roughly the top 16 percent, 130 is roughly the top 2 percent or about 1 person in 44, 145 is about 1 in 740, and 160 is about 1 in 31,000. Those anchors are what make a three digit number interpretable at all, and any provider reporting an IQ figure is implicitly claiming a place on some such scale.

MyIQ's public pages do not state which scale its score uses, what its mean and standard deviation are, or against whom you are being compared. That is the gap. But the start page does display one number that is worth pausing on: when we loaded it in August 2026 it carried a rotating counter reading "Today's average IQ score: 128."

Take that at face value and it is a striking statistic. On a properly normed deviation scale, an average of 128 among takers would mean the typical MyIQ user sits near the top 3 percent of the general population. Two explanations fit. Either the population choosing to take a paid online IQ test is extraordinarily selected, which is partly true but nowhere near enough to move a group mean 28 points, or the score is not scaled to a general population reference at all and the displayed figure reflects the site's own scoring rather than a population percentile.

We are not in a position to say which, because the scaling is not published. What we can say is that a displayed taker average of 128 is inconsistent with the ordinary reading of an IQ number, and that a reader who receives a flattering score from MyIQ should hold it against that context. If you want the population anchors that a real score gets compared against, our IQ percentile chart and the discussion of what average IQ actually means lay them out with the arithmetic visible.

4 Norms: What We Looked For and Did Not Find

A norm sample is the reference group your raw performance gets converted against, and it is the single thing that turns a count of correct answers into an IQ score. A usable norms description answers a short list of questions: how many people, recruited how, from which countries, with what age bands, what education and sex distribution, what exclusions were applied, and whether the sample was weighted to match census figures.

Across the start page, the homepage, the MyIQ Help Center, the terms and the refund policy, we found no answer to any of those questions in August 2026. The Help Center's article list covers subscription cancellation, auto renewal, email changes, account deletion and the legal policies. It contains no article on how the score is calculated and no methodology page.

This absence needs stating carefully, because the honest claim and the dramatic claim are different. The honest claim: we could not locate a public norming description for MyIQ. That is a transparency limitation, and a real one for a buyer, since it means you cannot check the comparison being made on your behalf. It is not evidence that no internal norming exists. A provider can hold unpublished data, and unpublished is not the same as nonexistent.

Note also what did not appear on MyIQ's own pages. A third party article describes MyIQ as delivering reports "based on the Stanford-Binet Intelligence Scale." We could not find that claim anywhere in MyIQ's own published material, and the Stanford Binet Fifth Edition is a proprietary instrument published by Riverside that is administered by qualified examiners rather than licensed to consumer websites. Attributing that pedigree to MyIQ on the strength of a third party summary would be exactly the sourcing error this page exists to avoid. If you see the claim repeated, ask where MyIQ says it.

5 Reliability, Precision, and a Consequence of the Privacy Design

Reliability answers something a shopper can state without any statistics vocabulary: if you took the same test again next Tuesday, how different would your score be? Instruments answer it with two published figures, an internal consistency coefficient such as coefficient alpha or omega, and a standard error of measurement that converts into a confidence interval printed next to the score. A well built adult battery reports a full scale standard error near three points, which is why professional reports say something like "108, with a 95 percent confidence interval of 103 to 113" instead of a naked integer.

We located no reliability coefficients, no standard error, and no test retest data in MyIQ's public materials in August 2026, and no confidence interval is promised around the delivered score. A number with no interval attached invites the reader to treat a noisy estimate as an exact fact, which is the most common way online IQ results get misread.

There is a second point here that emerges from an unexpected place. MyIQ's privacy policy states that it stores "final IQ scores, completion timestamps, performance metrics" but that "individual test answers are processed in real time and are never stored." As a privacy commitment that is unusually good and we credit it below. As a psychometric constraint it is severe, and the two facts sit in genuine tension.

Internal consistency reliability is computed from item level response patterns. So is item analysis, differential item functioning, and any check on whether a given question is discriminating between stronger and weaker takers or simply confusing everyone. If item responses are never retained, none of those analyses can be run on live data, item quality cannot be monitored as the taker population shifts, and a past administration cannot be rescored if a scoring bug is found. The design is a real privacy benefit that carries a real measurement cost, and a buyer is entitled to know that the trade was made.

Deeper treatment: how accurate online IQ tests can actually be.

6 Validity and the Stated Use Boundary

Validity asks whether the score means what its name implies, and it is established by evidence rather than assertion: correlations with established batteries, factor structure showing the items load where they should, and predictive relationships with outcomes the construct is supposed to forecast. We found no published validity studies for MyIQ, and no claim that any exist.

What MyIQ does publish is a use boundary, stated repeatedly and prominently. The site footer says the test is "for entertainment or educational purposes only and is not a substitute for professional evaluation." The terms go further, describing the offering as providing "IQ testing and brain training services for educational entertainment only," and stating that results are not equivalent to clinical assessment and should not be used for academic or professional decisions.

Give the company credit for the clarity of that disclosure. It is unambiguous, it appears in more than one place, and it is not buried in a subclause. Plenty of consumer IQ sites drape themselves in scientific language while quietly disclaiming everything in a footer; MyIQ's disclaimer is legible from the start page.

The tension a buyer has to resolve is between that boundary and the surrounding marketing. The homepage promises a "complete cognitive profile revealing your strengths and natural thinking patterns" alongside a score with a "detailed breakdown." A cognitive profile with identified strengths is, by definition, a set of separately measured domain scores; delivering one from forty undifferentiated items and then declaring the whole thing entertainment is a combination that pulls in two directions at once. The disclaimer is the load bearing statement, because it is the one the company would rely on if anyone acted on the result and it went badly.

The practical consequence is a short list of things a MyIQ number cannot do, and this list is not specific to MyIQ. It cannot support a diagnosis, an accommodation request, a school placement, a hiring decision, a legal filing, or a high IQ society application. Those uses require a supervised administration of a recognized instrument by a qualified examiner, which is a different product category at a different price. Our comparison of professional versus online IQ testing covers where the line falls and why.

7 The Price Ladder as Published in August 2026

Here is the full plan structure listed in the MyIQ terms and conditions in August 2026, with annual totals computed from the stated intervals. The legal entity named in those terms is Envest Research Inc., at 2093 Philadelphia Pike #3129, Claymont, DE 19703, United States. Prices change and regional pricing varies by currency and local tax, so the checkout screen you personally see is the controlling record, not this table.

Trial: $1.00 / 7 days

A one time charge to unlock results. The terms note it may process as two separate $0.50 charges for payment verification, so two odd line items on your statement are expected behavior.

Basic: $9.99 / week

The shortest billing interval offered. At 52 weeks that totals about $519 across a year, the most expensive plan on the ladder despite the smallest sticker.

Premium: $14.99 / 2 weeks

Billed every fourteen days, roughly 26 charges a year, totalling about $390. Note that the name suggests an upgrade while the interval is what changes.

Starter: $19.99 / 28 days

The cheapest entry on the 28 day cycle. About 13 charges a year, or roughly $260 annually if left running.

Promo: $24.99 / 28 days

An intermediate 28 day tier. Roughly $325 a year. The published terms do not specify what distinguishes its feature set from the others.

Standard: $29.99 / 28 days

The tier the start page presents after the trial. About 13 charges a year, or roughly $390 annually, and the figure most buyers will encounter.

Two observations. The plan the funnel steers you toward is not the cheapest, and the weekly plan, which looks like the smallest commitment, is the costliest way to hold the product for a year. That inversion is common in subscription design and is not unique to this company, but it is worth seeing laid out in a single view before choosing.

8 The 28 Day Cycle, and Why It Is Not a Month

This is the detail most worth carrying away from the page, and it is pure arithmetic on published figures rather than an accusation of anything.

MyIQ's start page describes the recurring charge as "29.99$/28 days." A calendar year contains 365 days. Divide by 28 and you get 13.04 billing cycles per year, not 12. At $29.99 per cycle, a subscriber who keeps the plan for a full year pays about $389.87. A genuinely monthly plan at the same headline price would cost $359.88. The 28 day interval therefore produces one extra charge annually, worth roughly $30, compared with what most readers assume when they see a price and the word "month."

The second effect is drift. A monthly subscription bills on the same calendar date every time, which is easy to remember and easy to spot on a statement. A 28 day subscription moves earlier each cycle, so a charge that lands on the 3rd of one month arrives on the 31st of the next, then the 28th, then the 25th. There is no fixed date to watch for, which makes an unwanted renewal materially harder to notice on a busy statement.

None of this is hidden. The interval is written plainly on the start page and in the terms, so the information is fully available to anyone who reads the number rather than skimming the shape of it. That is precisely why we flag it as a practice rather than a trick: it is disclosed, it is legal, it is common in this corner of the consumer web, and it costs inattentive buyers roughly one extra payment a year. Third party summaries that describe MyIQ as "$29.99 per month" are simplifying away the part that matters, and readers should treat that shorthand as the reason to check the source.

9 Cancellation and Refunds in the Provider's Own Words

MyIQ's help article on unrecognized recurring charges sets out the conversion mechanics directly: "all subscriptions begin with a 7-day trial period for $1.00, which automatically converts to your selected subscription rate after the trial period ends." It frames the timeline as day 1 to 7 at $1.00 total, and day 8 onward at the selected rate. Cancellation is available "anytime through our self-service portal," with the qualifier that "you must cancel before renewal to avoid charges." The terms add email at help@myIQ.com and the Help Center as alternative routes, and state that service continues until the current period ends after you cancel.

The refund policy is where a buyer should slow down, because it is unusually explicit. The company states that it does not "usually operate a standard refund program," that requests are reviewed case by case at its discretion, and that approved refunds process to the original payment method within three business days. It then lists what is not refundable, and the list includes unused subscription time after cancellation, plan downgrades, service interruptions during maintenance, a change of mind, and, stated directly, failure to cancel before an automatic renewal.

Read those two documents together and the structure of the offer is fully visible. The trial converts on its own, the renewal is automatic, the interval shifts earlier each cycle, and forgetting to cancel is named in advance as a circumstance that does not qualify for a refund. Every one of those terms is published, and none of them is unusual on its own. The combination is what determines the practical cost of inattention, and it is knowable before you enter a card.

The defensive routine follows from the terms rather than from anything we need to allege. Screenshot the checkout page showing the exact plan, interval and amount before paying. Put a calendar reminder on day 6 of the trial, not day 7. Cancel through the self service portal and keep the confirmation. Then check the following statement, because the interval will not land where you expect it. Those four steps cost five minutes and neutralize the entire risk described in this section.

10 Privacy and What Happens to Your Data

MyIQ's privacy policy is more detailed than most consumer test sites publish, and it splits cleanly into a part that is better than average and a part that buyers routinely do not expect.

The better than average part: individual test answers are described as processed in real time and never stored, with only final scores, completion timestamps and performance metrics retained. Payment data is limited to tokenized identifiers and the last four digits of a card. The policy recognizes rights under the GDPR, the CCPA, the Australian Privacy Act and PIPEDA, offering access, correction, deletion, portability and objection, with a stated thirty day response window and a thirty day account deletion process. Security logs are held thirteen months and communication records two years. That is a legible retention schedule, and many competitors publish nothing comparable.

The part to read twice: the policy names Facebook, Google, Snapchat and TikTok among parties that receive "anonymous identifiers, email addresses (for advertising purposes), usage data." Analytics partners listed include Google Analytics, MixPanel, Sentry and Cloudflare. Sharing a hashed or plain email address with major ad platforms is standard practice for consumer subscription businesses and it is disclosed here rather than concealed, but it means the address you use to retrieve an IQ score becomes an advertising identifier across several networks. Data for active accounts is retained indefinitely.

None of this is exotic, and disclosing it is better than the alternative. The point for a reader is simply that the transaction is larger than it appears at checkout: you are paying a subscription fee and also contributing an advertising identifier tied to a psychological self assessment. Whether that trade is acceptable is a personal call, but it should be a made call rather than a discovered one. Anyone uncomfortable with it can use an address reserved for signups and exercise the deletion right the policy grants.

11 Strengths and Limitations Side by Side

Reviews that find nothing good in a competitor are not reviews. Here is the honest ledger, restricted to what MyIQ publishes about itself.

DimensionWhat works in MyIQ's favorWhat limits it
Test length40 items of rising difficulty, well beyond the 10 to 20 item quizzes it competes with in search resultsMore items in one format raises precision without adding coverage of separate abilities
Item designSix answer options reduces the score you can earn by guessing, and skipping back to hard items is a sensible affordanceNo published statement of which abilities the items sample or how many target each
Score reportingA numeric result with a promised breakdown, delivered quicklyNo confidence interval, no stated scale, no described comparison group
DocumentationTerms, refund policy and privacy policy are all public and reasonably specificNo technical manual, reliability coefficients or validity evidence located in August 2026
Honesty of framingThe entertainment and educational use boundary is stated plainly in several placesMarketing language about a complete cognitive profile pulls against that boundary
PricingThe trial cost, plan ladder and renewal terms are all published rather than hiddenA 28 day cycle yields about 13 charges a year, and missed cancellation is named as non refundable
PrivacyItem responses are not stored, retention periods are published, and major privacy regimes are recognizedEmail addresses go to several ad platforms, and active account data is retained indefinitely

The pattern across the rows is consistent. MyIQ is a competently built consumer funnel that documents its commercial terms carefully and its psychometric terms not at all. That is a coherent product for someone who wants a diversion. It is an incoherent product for someone who wants to know something about their own cognition, because the number arrives without any of the apparatus that would let them interpret it.

12 Who It Fits, Who It Does Not, and Where ACIS Sits

MyIQ fits a reader who wants fifteen minutes of reasoning puzzles and a number at the end, who understands the result is entertainment, and who will cancel deliberately rather than by accident. For that person the trial is a dollar and the experience is smoother than most free alternatives. There is nothing wrong with buying that. Two useful contrasts sit at opposite ends of the market: the free Open Psychometrics test, which publishes its dataset, and the BMI Certified IQ Test, which pairs a shorter test with a similar recurring charge.

It does not fit anyone with a decision attached to the outcome. If you are weighing a gifted program, an accommodation, a career question, or a persistent worry about your own cognitive functioning, a score with no published norms and no confidence interval cannot carry that weight, and neither can any online self assessment. Those questions belong with a qualified psychologist administering a recognized battery under supervised conditions, and no amount of item count changes that.

Between those two poles sits the reader who wants something rigorous but is not seeking a clinical evaluation, and that is where we build. ACIS is our product and we have an obvious interest in your clicking through, so the honest description of it should include its limits. ACIS is a self administered online assessment. It is not clinical, not diagnostic, and not an institutional credential, and its results carry no legal or educational standing. What differs from the product reviewed here is the documentation: ACIS runs 20 subtests across six CHC domains, reports a profile by domain with confidence intervals rather than a lone number, publishes its technical manual with the provenance of its norms stated plainly, and charges a one time price with no recurring billing of any kind.

We make no claim to rank first on accuracy among online tests, and we would distrust any provider who made that claim about itself. We are claiming that a score should arrive with the information needed to interpret it, and that a reader can check whether we do that before paying anything, which is the same standard we applied to MyIQ throughout this page. If it does not hold up, the technical manual is public and the criticism is welcome.

If you want a wider survey of what else is out there before deciding anything, our roundup of the best online IQ tests covers the field with the same documentation checklist applied to each entry.

13 Frequently Asked Questions

What does MyIQ charge after the trial?

The start page listed $29.99 recurring every 28 days in August 2026, following the $1.00 seven day trial. Cheaper and more expensive tiers exist in the terms. Confirm at checkout, since offers and currencies vary.

Is MyIQ a one time purchase?

No. Every plan described in the terms is recurring and auto renews until you cancel. The dollar you pay first is a trial fee, not the total cost of the product.

Why does my statement show two 50 cent charges?

The terms state that the trial payment may be processed as two separate $0.50 charges for payment verification. Seeing that pair instead of a single dollar is documented behavior, not a duplicate billing error.

How many billing dates fall in a year on a 28 day plan?

Around thirteen, since 365 divided by 28 is just over 13. The charge date also moves earlier each cycle, so there is no fixed calendar day to watch for.

How do I cancel MyIQ?

The published routes are the self service portal in your account, the Help Center, or emailing help@myIQ.com. Cancel before the renewal date and keep whatever confirmation you receive.

Can I get money back if I forgot to cancel?

The refund policy names failure to cancel before automatic renewal as a non refundable circumstance, alongside change of mind and unused subscription time. Requests are considered case by case at the company's discretion.

How long does the test take?

The homepage indicates roughly fifteen minutes for the full sequence. Since you may skip items and return to them, individual completion times will vary somewhat.

Does the difficulty adapt to my answers?

The pages we read describe a fixed order of growing difficulty, which is not the same as adaptive branching driven by your responses. No adaptivity is claimed in the public material.

Does MyIQ publish a technical manual?

We did not find one in August 2026, and the Help Center contains no methodology article. Absence from the public site does not prove that no internal documentation exists.

Is the MyIQ test based on the Stanford-Binet?

A third party article says so, but we could not find that claim on any MyIQ page. The Stanford-Binet Fifth Edition is a proprietary examiner administered instrument, so treat the attribution as unverified.

Why does the site show an average score of 128?

The counter appeared on the start page without explanation of how it is computed or which population it references. Anyone reading their own result should keep that unexplained figure in mind.

Will MyIQ qualify me for Mensa?

No. High IQ societies accept supervised administrations of specified instruments with documented norms. A consumer web test labelled for entertainment does not appear on any such list.

Can I use the result for a school or workplace accommodation?

No. Accommodations require an evaluation by a qualified professional using recognized instruments. MyIQ's own terms rule out academic and professional use of its results.

Are my individual answers stored?

The privacy policy says they are processed in real time and never retained, with only the final score, timestamps and performance metrics kept. That is stronger data minimization than most competitors offer.

Who receives my email address?

The privacy policy lists advertising platforms including Facebook, Google, Snapchat and TikTok as recipients of email addresses for advertising purposes, alongside several analytics providers.

Can I have my data deleted?

Yes. The policy grants access, correction, deletion, portability and objection rights under the GDPR, CCPA, Australian Privacy Act and PIPEDA, with a stated thirty day handling window.

Who legally operates MyIQ?

The terms name Envest Research Inc., with an address in Claymont, Delaware. That is the entity a billing dispute or data request would be directed to.

Should I trust user reviews of MyIQ?

Read them yourself rather than trusting anyone's summary, including ours. Public review pages exist on Trustpilot and elsewhere, and crowd ratings speak to service experience rather than to whether a score is psychometrically sound.

Is a longer test automatically a better test?

Longer helps precision, which is real, but coverage and norming matter more for interpretation. Forty well written items measuring one narrow ability still cannot describe a profile.

What should I screenshot before paying?

The checkout panel showing plan name, amount, currency and billing interval, plus the date. If the amount later differs, that image is the only record you will control.

Could this assessment change?

Yes, and it should be rechecked. If MyIQ publishes norms, reliability figures or validity work, or revises its billing interval, the conclusions here would need revisiting against the live pages.

Sources Behind This Page

A review is only as good as the yardstick behind it. These sources document the measurement standards this review applies and the consumer practices it checks for.

  • American Psychological Association. The Standards for Educational and Psychological Testing, the joint AERA, APA and NCME framework that legitimate tests are built and evaluated against.
  • Buros Center for Testing. The independent center whose Mental Measurements Yearbook has reviewed commercial tests since 1938. The reference point for claims about test quality.
  • American Psychological Association. Understanding psychological testing and assessment. What professionally administered testing involves and how it differs from informal quizzes.
  • Federal Trade Commission (2022). Bringing Dark Patterns to Light. The FTC staff report on design practices that obscure subscriptions and charges, worth checking any paid online test against.
  • Pearson Clinical Assessment Scientific Council (2023). Standardized Clinical Assessment for Practitioners: A Primer. How standard scores, percentile ranks and the standard error of measurement are meant to be read together.
  • Pearson (2008). WAIS-IV Score Report sample. What a real report contains: every composite paired with a percentile rank, a 95% confidence interval and a qualitative description, never a bare number.
  • Crawford, J.R., Garthwaite, P.H. & Slick, D.J. (2009). On percentile norms in neuropsychology. The Clinical Neuropsychologist, 23(7), 1173-1195. Three definitions of a percentile coexist in practice and can return different results for the same score.
  • Voncken, L., Albers, C.J. & Timmerman, M.E. (2019). Improving confidence intervals for normed test scores. Behavior Research Methods. Open access. Documents the mean 100, SD 15 metric and the uncertainty that norming from samples adds to any score.
  • Trahan, L.H., Stuebing, K.K., Hiscock, M.K. & Fletcher, J.M. (2014). The Flynn effect: A meta-analysis. Psychological Bulletin. Open access. Scores rose about 2.31 points per decade across 285 studies, which is why norms age and older scores overstate standing.
  • Pearson (2024). WAIS-5, Wechsler Adult Intelligence Scale, Fifth Edition. The current adult battery, covering ages 16:0 to 90:11 across five cognitive domains.
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