What makes a posttest-only design stronger in terms of internal validity than a design with a pretest?

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What makes a posttest-only design "stronger" in terms of internal validity than a design with a pretest? Is it more appropriate to include random assignment for these designs? Why or why not?

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An Applied Guide To Research Designs Quantitative Qualitative And Mixed Methods

ISBN: 249814

2nd Edition

Authors: W. Alex Edmonds, Tom D. Kennedy

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Question Posted: Mar 26, 2024 07:01 AM

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What makes a posttest-only design stronger in terms of internal validity than a design with a pretest?

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An Applied Guide To Research Designs Quantitative Qualitative And Mixed Methods

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