What is the most effective therapy for obsessive-compulsive disorder?

In using inferential statistics we should initially assume that in any experiment, the scores

obtained from different groups of participants a. will reflect all possible differences between the groups. b. will be due only to the manipulation of the independent variable. c. should be statistically significant. d. will be different simply due to chance. e. will only be different if the groups have been subjected to different conditions.

Obtaining a complete understanding of human personality requires that

A. we focus on one or two specific approaches as a maximum. B. we examine every aspect of personality from a biological perspective. C. we focus our attention on the cognitive approach. D. we examine personality from several different perspectives.