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What is the difference between the static group comparison design and the posttest-only control group?

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The solution provides difference between the static group comparison design and the posttest-only control group

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Difference between static group comparison and postest-only control Group
what is the difference between the static group comparison design and the posttest-only control group?
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Static-group comparison
In this design, two unrandomized groups are arbitrarily selected from the general population. One is designated as the experimental group and the other ...

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