- z = (X − μ) / σ, where μ and σ come from the same defined population as X.
- IQ ≈ 100 + 15z when the battery was scaled that way.
- A percentile is a rank.
- You can subtract any number you like.
- It only means below that group’s mean.
- Mental-math for arithmetic comfort; pattern-matrices-lite as a puzzle.
How do I compute z?
z = (X − μ) / σ, where μ and σ come from the same defined population as X. Using a made-up μ from a blog is not psychometrics.
How does that become IQ 100/15?
IQ ≈ 100 + 15z when the battery was scaled that way. The 15 is a convention, not a law of nature, and it does not apply to unnormed toys.
What is a percentile versus a z?
A percentile is a rank. A z is a location on a bell if the distribution is roughly normal. Ranks do not require normality; z-to-IQ conversion usually assumes it.
Can I z-score my dot-compare-lite hits?
You can subtract any number you like. Without a documented μ and σ for that exact task, the z is decorative, not a clinical IQ.
What about negative z?
It only means below that group’s mean. It is not a defect label. Web games should not be used to rank children or job applicants.
Where can I practice related ideas?
Mental-math for arithmetic comfort; pattern-matrices-lite as a puzzle. Neither outputs a valid z against a published manual.
❓ People also ask
What Is Attention Control?
Attention control is the skill of holding a current goal and filtering noise — a side conversation, a flashing tab, or a flanking arrow on a screen. It overlaps working memory and inhibition, yet it is not a synonym for IQ, and a browser hit count is not a diagnosis. Labs time tightly controlled trials; this site offers lite practice only, with no clinical battery behind the score.
What Is Attention Control? →IQ and Income
Surveys often find a positive correlation between cognitive-test scores and later earnings, but the path is noisy: education, health, networks, discrimination, and luck all sit in between. A correlation is not a paycheck forecast, and a higher score on a web game here is not a raise, a credential, or a clinical IQ. Group charts never tell you one person’s worth or hiring outcome.
IQ and Income →Visuospatial vs Verbal
Cognitive batteries often split visuospatial puzzles from verbal ones so you can see different strengths, not a single destiny. A high spatial sketch and a high vocabulary can diverge; neither pattern is a diagnosis. Online letter-span or hidden-figures lite games sample a slice of those families — they are not Wechsler indexes, not clinical IQ composites, and not career oracles.
Visuospatial vs Verbal →What Is Cognitive Flexibility?
Cognitive flexibility is the ability to update a rule when the world changes — switching from color to shape, or from one task set to another, without staying stuck. It is one executive-function toy, not a full intelligence profile. Task-switch lite on this site is original practice with no age norms, no standard error, and no clinical IQ attached to the hit count.
What Is Cognitive Flexibility? →Test Norming Basics
Norming is how a published test turns a raw hit count into a number you can compare with a reference group of the same age. Without a documented sample, a standard deviation, and a date, a web score is just a count. This site’s games are not normed batteries and must not be read as a clinical IQ, a school placement, or a medical finding.
Test Norming Basics →