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I took the TRI-52, which is strongly correlated with other cognitive ability tests. When I first took it, I was tired, my mind was foggy, and my ADD was acting up -- I got a score of 116. The following day, I took it while well rested & with improved concentration, and got a score of 125. I did not receive any feedback on any of the questions, so I've no idea which questions I got right or wrong; this might mitigate the impacts of the practice effect. Which is a more accurate representation of my score? My first attempt, even though I took it in suboptimal conditions, or my second attempt, which might be susceptible to practice effect?

omeed
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    Those scores are probably within the margin of error, which means they are effectively the same. – Bryan Krause Oct 05 '20 at 16:43
  • What do those scores mean, in terms of intellectual ability? – omeed Oct 07 '20 at 01:26
  • Not much, honestly. IQ tests are only really useful in looking at populations and in diagnosing serious disability. In the middle they aren't very predictive for individuals. – Bryan Krause Oct 07 '20 at 02:37
  • Isn't the margin of error between exams supposed to be ~5, not ~9? – omeed Oct 23 '20 at 23:01
  • I'll repeat myself: "IQ tests are only really useful in looking at populations and in diagnosing serious disability. In the middle they aren't very predictive for individuals." There isn't a practical meaning of the difference between the scores. It doesn't matter what the specific test-retest reliability is for a given test, that doesn't tell you anything except about the test itself. – Bryan Krause Oct 23 '20 at 23:04

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