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A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?

1. σ = 5 and n = 25

2. σ = 5 and n = 50

3. σ = 10 and n = 25

4. σ = 10 and n = 50

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