15 - Two Dependent Groups

15 - Two Dependent Groups - Chapter 15 Testing for a...

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Unformatted text preview: Chapter 15: Testing for a Difference Between Two Dependent (Correlated) Groups • So far, have examined differences between independent groups • Can also have dependent samples design – Study in which measurements in one sample are somehow related to measurements in the other sample(s) Types of Dependent Samples Designs • Repeated Measures: Same participants are measured under two (or more) conditions – Benefit is that each subject serves as his/her own control • Matched Subjects : Different participants in each group, but matched on some variable with a person in the other group – E.g., might match people on age, or IQ scores • Matched Pairs: Situation in which participants are naturally paired based on some characteristic – E.g., Identical twins • With independent samples, any variability not related to IV is considered “error” (goes into ) • With correlated samples, can account for some of what was error (within-condition variability) – Correlation between pair’s observations or person’s observations across groups s X- Y Y...
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15 - Two Dependent Groups - Chapter 15 Testing for a...

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