When it is important to show a relationship between test scores and a future behavior, researchers establish evidence of validity using what method?

Conceptually, the standard deviation for a distribution can be thought of as:

A) the center of the distribution. B) the average frequency for each category. C) the average distance from the mean. D) the distance between the highest and lowest value.

In the United States, early verbal tendencies in girls

a. are discouraged. b. are reinforced. c. occur more often in lower socioeconomic families. d. are random and unpredictable.