Chapter 8 slides

Chapter 8 slides - Chapter 8 Experimental Design...

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Chapter 8 Experimental Design
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Confounding and Internal Validity Researchers must design and conduct studies that allow only the IV to cause the results. Eliminate all possible confounds Internal validity is present when only the IV affects the DV.
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Post-test Only Design Has two equivalent groups of participants: experimental group and control group. IV is introduced and then DV is measured.
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Post-test Only Design
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Selection differences* - differences in the type of subjects who make up each group. It is very bad if the people in each group differ in a systematic way. Groups are made equivalent by random assignment to groups *something you must be aware of in a Post-test only design
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Effect of the IV - If …the groups were equivalent, the same measurement was used on each group, and there were no confounds… Then …the IV caused any possible changes in the DV.
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Pretest-posttest design Just like the posttest-only design
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This note was uploaded on 06/06/2011 for the course PSYC 226 taught by Professor Hutcheson during the Spring '11 term at South Carolina.

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Chapter 8 slides - Chapter 8 Experimental Design...

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