NEUR 2001 Study Guide - Final Guide: Confounding, Repeated Measures Design, Measuring Instrument
18 Dec 2015
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Chapter 9 - experimental design: within groups (pre- test, post- test) In a sense it is the. Ul5mate in equivalent groups due to the sole fact that it is the same group every 5me. Must have two or more treatment condi5ons (one can be a control). The within- subjects design looks for di erences between treatment condi5ons within the same group of people. By measuring/removing individual di erences the wsd reduces variance and reveals treatment e ects that might not be apparent in a. Bsd: wsd is generally more likely to detect a treatment e ect than a between- subjects design. The analysis rst computes a variance that measures the size of the actual mean di erences (bigger the di erence. The analysis then computes a second variance (error variance) which is the one in uenced by individual di erences. The analysis then compares the two variances. If your condi5ons vary in some way other than the iv (5me, place)
