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 pairs observations or persons observations across groups s X- Y Y...
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This note was uploaded on 04/17/2008 for the course PSY 201 taught by Professor Arthur during the Spring '08 term at Purdue University-West Lafayette.

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

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