1. In the following study what is the independent variable: “The effects of childhood mental abuse on drug use and criminality .”
a. childhood mental abuse
b. criminality
c. drug use
d. childhood
2. A researcher wanted to examine the effects of a new drug on anxiety, so the researcher gave the drug to group A and to group B gave no drug. The researcher then followed both groups for a period of a month and then reported the results. This is known as a____________________.
a. qualitative study
b. true experiment
c. correlational study
d. longitudinal study