How would you calculate the standard deviation of a set of scores?
a. Take the square root of the variance
b. You cannot calculate the variance of the scores with the given information.
c. Square the variance.
d. Square the mean.
e. Take the square root of the mean.
Ans: a. Take the square root of the variance
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Dr. Hall found a positive correlation between depression and child abuse; depressed mothers were more likely to abuse their children. Which of the following explanations best illustrates the third-variable problem?
a) Abusing one's children may cause depression. b) Poverty may cause both depression and child abuse. c) The relationship between depression and child abuse may apply only to women. d) Abused children may have a predisposition to become depressed.