PSYC 21621 Lecture Notes - Lecture 26: Blood Pressure

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Chapter 11: within-subjects t-test aka t statistic for repeated measures. Within-subjects: same sample at different times, examples, beginning and end of a school year, blood pressure before/after a mindfulness-meditation intervention. Why should we use a within-subjects t-test: requires fewer individuals, uses people more efficiently because everyone is in both conditions, study changes over time. If we are interested in development: eliminates individual differences, because we are using the same people for each condition, we know differences are not due to individual differences. Within-subjects t-test assumptions: observations within each treatment condition must be independent, population distribution of difference scores (d values) must be normally distributed, not typically a serious concern unless the sample size is small (n<30) Learning check: for which of the following would a repeated-measures study be appropriate, a group of twins is tested for iq (matched, students" knowledge is tested in september and december.

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