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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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The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
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