Discuss all threats to internal validity

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Reference no: EM1322791

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

Reference no: EM1322791

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