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What were the research findings regarding “effect size”? Discuss the role pre-test and post-test played in...

What were the research findings regarding “effect size”? Discuss the role pre-test and post-test played in the research analysis.

Math   Statistics-And-Probability   
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Answer #1

The effect size for the repeated measures test = xd/sd

A pretest-posttest design is usually a quasi-experiment where participants are studied before and after the experimental manipulation. Quasi-experimental simply means participants are not randomly assigned.

The reason you run a pretest-posttest experiment is to see if your manipulation, the thing you're looking at, has caused a change in the participants. Since everyone is being manipulated in the same way, any changes you see across the group of participants is likely from the manipulation. This means you test them before doing the experiment, then you run your experimental manipulation, and then you test them again to see if there are any changes.

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