PSYCH 2220 Lecture Notes - Lecture 10: Computer Monitor, Null Hypothesis, Mean Absolute Difference
22 Mar 2018
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2 sample means and a within-groups design. Same (or linked) ppl, measured twice under 2 diff conditions. E. g. repeated measures, matched samples, longitudinal data, etc. Tests mean difference scores (md) instead of one mean against the pop. mean. Difference scores = set of scores that represent the difference b/t 2 measurements. Null hypothesis of no difference b/t means. H0: (cid:883) = (cid:884)or (cid:883) (cid:884)= 0 or d = 0. Study of how 5 ppl performed on a set of tasks under 2 conditions: using a 42 inch monitor or using a 15 inch monitor. Pop 1: ppl doing tasks on the 42 inch monitor. Pop 2: ppl doing tasks on the 15 inch monitor. Not stated, be careful about generalizing to others (maybe other employees in the company) Probably, time to complete a task is assumed to be normal. H0: there is no difference in time taken to complete task between the 15-inch monitor.
