Any association that was significant as a simple correlation will be significant in a multiple regression equation predicting the same criterion variable

The biological approach to studying adolescents focuses on:

A) sexual maturation and genes. B) changes in the way adolescents think. C) emotions and the self. D) adolescent social relations.

Which type of study do personality researchers commonly use to study different age and generation groups at the same time?

a. cross-sectional study b. experiment c. longitudinal study d. field study