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Pretests, posttests and threats to internal validity.
Answer the question either by writing the design name or by describing the design using standard notation (X = program, O = observation, R = random assignment). For each design, please discuss all threats to internal validity.
1.Design: Single group with three pretests and four posttests
2. Internal validity threats
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For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
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