Question: 10.47 How large a sample is required in Exercise 10.20 if the power of the test is to be 0.90 when the true mean is

10.47 How large a sample is required in Exercise 10.20 if the power of the test is to be 0.90 when the true mean is 950 grams? Assume that σ = 70 grams.

10.48 If the distribution of life spans in Exercise 10.19 is approximately normal, how large a sample is required in order that the probability of committing a type II error be 0.1 when the true mean is 35.9 months?

Assume that σ = 5.8 months.

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