All experimental designs are variations of the ___________________________ which has random assignment,a pretest and a posttest,an experimental group,and a control group.

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The classical experimental design is the only one mentioned that includes all the components listed - random assignment, pretest and posttest, experimental group, and control group. Quasi-experimental designs may not have random assignment or a control group, the one-group pretest-posttest design does not have a control group, and the one-shot case-study design does not have a pretest or control group.

All Experimental Designs Are Variations of the ___________________________ Which Has