Many standardized tests have a known ______.

Social support tends to __________ the effects of stress

a. increase c. corrupt b. decrease d. corroborate

Suppose you are interested in how participants perform under different temperature conditions. You randomly select 30 participants and randomly assign them to work in one of three rooms. The rooms differ only with respect to temperature. You instruct all participants to solve the same jigsaw puzzle, and then you measure how long it takes each one to finish. In this research, temperature serves as

the a. condition. c. dependent variable. b. independent variable. d. sample.