PSY201 9.9.13 To post

Below the mean z scores are helpful to compare scores

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Unformatted text preview: cabulary (understanding of language)   M = 12   SD = 6   This child is ½ SD above the mean   Thus, this child is above average on recepIve language, but not by a lot ­ half as much as the average score differs from the mean 3 9/9/13   Z ­score represents the number of standard devia+ons a score is above or below the mean   Z scores are helpful to compare scores on measures that have completely different scales   From prior examples: if a child scored 60 on the inhibitory control test and 15 on the recepIve vocabulary test   We can say that the child scores lower (1 SD) than average on inhibitory control and slightly higher (1/2 SD) than average on recepIve vocabulary   How can we compare a person’s scores on different variables?   Example: Measuring children’s inhibitory control and their recepIve language ability   Does a child have similar ability across these two domains of funcIoning?   In short, we would like to be able to express a person’s score with respect to both (a) the mean of the group, and (b) the variability of the scores   How far is a person from the mean?   How typical is it to be that distance from the mean? 4 9/9/13   Number of standard deviaIons a score is above or below the mean   Formula to change a raw score t...
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