The tests commonly administered as a precondition for voting, in an attempt to limit African Americans from voting were called

If a researcher wishes to categorize participants on the variables of sex and psychiatric diagnosis, he or she would arrange the data in a matrix called

A) A graph. B) A cross-tabulation. C) A frequency distribution. D) A cross-linear matrix.

A general but important rule in experimentation is that each study is designed so as to

A) control experimental variance, maximize extraneous variance, and control error variance. B) maximize experimental variance, control extraneous variance, and minimize error variance. C) maximize all variance except error variance. D) ignore error variance and maximize between-groups variation.