PS395 Midterm: PS395 Midterm 1
Document Summary
Examines differences in mean (parametric) dependent variable scores across 2 within group conditions (iv) measured across a single group. T score is found by examining the mean difference between the conditions in relation to the extent that scores vary in the sample. Often use w-g methods to conduct research because of the dif culties that we can encounter with between groups methods. Dif cult to completely eradicate individual differences in between-group studies. The only way to surely control for potentially extraneous variables is to match the groups on everything but the iv. If we don"t control individual differences properly, we cannot be con dent that the observed differences are not actually due to the extraneous variables (can use. Ancova but it doesn"t account for potential interfering variables) Bc of this, within-groups studies overcome this dilemma, thus related t test is popular.
