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A within-group design helps to eliminate confounds found in a between-groups research design by using a. a pretest-posttest design. b. different participants for each level

A within-group design helps to eliminate confounds found in a between-groups research design by using a. a pretest-posttest design. b. different participants for each level of the independent variable. c. multiple posttests. d. the same participants for each level of the independent variable

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