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experimental design

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This job talks about the randomized, pretest-posttest, control-group design nature of an experimental design.

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This job overviews experimental design.

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The very first thing to remember in research is that any research which does not include a manipulated independent variable and random assignment of participants to conditions is NOT an experiment. Remember also that experimental designs have two elements which include the
random assignment of participants to conditions and a control group.

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