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I need your help answering this question. Please help me by answering and showing explanations. Problem 2. Assume that the failure strength of a column

I need your help answering this question. Please help me by answering and showing explanations.

Problem 2. Assume that the failure strength of a column can be represented by a normal distribution where the population standard deviation is 4 psi. If you need the Width of the 95% condence interval to be 3 psi, how large of a sample (10 you need

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