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need help with question in pic plz Suppose we want to demonstrate equivalence between two treatments in mean cholesterol values with an acceptable margin of

need help with question in pic plz

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Suppose we want to demonstrate equivalence between two treatments in mean cholesterol values with an acceptable margin of 5 units between two treatments with 90 percent power using a two sided test at the 0.05 level of significance assuming the standard deviation of the response to be 60 and equal allocation. What is the sample size required

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