Researchers prefer to select participants who accurately represent the larger population that the researchers are interested in. This type of a group is called a _________ sample

A correlation is a numerical measure of the:

a. unintended changes in subjects' behavior due to cues from the experimenter. b. strength of the relationship between two variables. c. behaviors of subjects of different ages compared at a given time. d. behaviors of subjects followed and periodically assessed over time.

Which of the following individuals has the lowest risk of dying from SIDS?

a. Chin, who sleeps on his back b. Martin, who was born prematurely c. Malley, whose parents both smoke cigarettes d. Jean, who sleeps face down, on her stomach