Question: Referring to the melting point experiment in Exercise 10-25, suppose that the true mean difference in melting points is 3oF. How large a sample would

Referring to the melting point experiment in Exercise 10-25, suppose that the true mean difference in melting points is 3oF. How large a sample would be required to detect this difference using an a = 0.05 level test with probability at least 0.9? Use σ1 = σ2 = 4 as an initial estimate of the common standard deviation.

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