Jerika has to choose among four different ability tests. Of these options, which one represents the BEST choice?
A) a test with a validity coefficient of .15
B) a test with a validity coefficient of .30
C) a test with a coefficient of determination of .01
D) a test with a coefficient of determination of .00
Answer: B) a test with a validity coefficient of .30
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Which statement is TRUE of emotions?
A) they are the same as moods B) they usually have an identifiable cause C) they are not initiated by stimuli D) they are less likely than our moods to motivate someone to action
Suppose identical twins raised apart have a correlation of .40 on a measure of some aspect of personality, and identical twins raised together have a correlation of .60 on this same measure. From these data, what can we logically conclude about this trait?
a. Nonshared environment has an impact because, even raised together, the identical twins do not show a perfect 1.00 correlation. b. Nonshared environment has no impact because the identical twins raised apart have a lower correlation than the identical twins raised together. c. Shared environment has no impact because identical twins raised apart have a correlation lower than 1.00. d. Shared environment has an impact because identical twins raised apart have a correlation of .40.