The first true psychotherapy was __________

Colleges that __________ have a higher percentage of dropouts

A) do little to help high-risk students B) have high admissions requirements C) place great value on grade point average D) place students in developmental courses

Whenever the distribution of differences is normally shaped, and all its

assumptions are met, then a. the samples must represent different populations b. the samples must represent a single population c. more than two populations must be involved d. none of these, since when its assumptions are met, the distribution of differences is always assumed to be normally shaped