PSYC 60 Chapter Notes - Chapter 11: Null Hypothesis, Variance, Maryland Route 2
Document Summary
11-1 introduction to repeated-measures designs: repeated-measures or within subject design: dependent variable is measured 2 or more times for each individual in a single sample; same group of subjects used in all of the treatment conditions. Ex: measured before and after therapy: advantage: uses exactly the same individuals in all treatment conditions. 11-1a the matched-subjects design: matched-subjects design: involved 2 separate samples, but each individual in one sample is matched one-to-one with an individual in the other sample. The best you can get is a degree of match that is limited to the variable(s) that are used for the matching process: both matched-subject and repeated-measures designs are examples of related-samples designs. 11-2 the t statistic for a repeated-measures research design: t statistic is based on difference scores rather than raw scores. 11-2a difference scores: the data for a repeated-measures. Study: difference score = d = x2 x1, md is the mean for the sample of d scores.
