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A population: mean=80 and standard deviation=10. A researcher selects a sample of n=25 and administrates a treatment to each individual. It is expected an 9-point

A population: mean=80 and standard deviation=10. A researcher selects a sample of n=25 and administrates a treatment to each individual. It is expected an 9-point treatment effect. a=0.05. What is the power of the test

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