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Pretest-posttest design and internal validity threats.

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: Pretest-posttest design with experimental and comparison group

2. Internal validity threats

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Category:- Statistics and Probability
Reference No.:- M9727234

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