Basically, the standard deviation here is 15, and the median is 100, so what I did was first multiply the standard deviation, then add or subtract based on whether the standard deviation number is positive or negative.
But 15 isn’t the raw difference in IQ test scores. The raw difference in underlying test scores are (re?)normalised to a distribution with a mean of 100 and standard deviation of 15.
We don’t know what percentage difference in underlying cognitive ability/g factor 15 represents.
But 15 isn’t the raw difference in IQ test scores. The raw difference in underlying test scores are (re?)normalised to a distribution with a mean of 100 and standard deviation of 15.
We don’t know what percentage difference in underlying cognitive ability/g factor 15 represents.
Yeah, this is probably a big question mark here, and an important area to study.