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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
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
What is the probability of this actually happening?
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