Statistical regression in experiments is the tendency for
research participants who are near the 50th percentile on the pretest to show smaller gains on the posttest than research participants between the 1st and 20th percentiles.
research participants who are at the 95th or higher percentile on the pretest to show smaller gains on the posttest than research participants who are near the 50th percentile on the pretest.
the posttest to have lower validity for research participants in the control group than for research participants in the experimental group.
analysis of covariance to over-estimate the pretest-posttest gains for the experimental and control groups.
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