Problem Number Nine: Part A: Make a 90% confidence interval for given that you have a sample of size 49 which produced a sample mean of 8.2. You happen to know that = 3.2. Part B: How large of a sample should you need in order to get a confidence interval with length = .2.
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Sample size (n) = 49 Sample mean (x̄) = 8.2 Population standard deviation (σ) = 3.2 Confidence level = 90% Show more…
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