An independent variable is _____________?

An independent variable is _____________?

A. the only variable of interest
B. a variable that is independently verified
C. a variable whose value depends on that of the dependent variable
D. the variable that is manipulated by experimenter

Psychologists study animals because _______________?

Psychologists study animals because _______________?

A. animal behavior is just as complex as human behavior
B. experiments on people are generally considered to be unethical
C. the ethical treatment of animals is not mandated by professional guidelines
D. similar processes often underline animal and human behavior

A cross-sectional study is one in which ____________?

A cross-sectional study is one in which ____________?

A. the same people are retested over a period of years
B. different age groups are tested at the same time
C. different characteristics of a given individual are assessed at the same time
D. the behavior of a group is assessed by different researchers