A sample of size n = 56 is drawn from a normal population whose standard deviation is σ = 6.2. The sample mean is x̄ = 49.02. (a) Construct a 99.9% confidence interval for μ. Round the answer to at least two decimal places. (b) If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain.
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We are given the sample size (n=56), the population standard deviation (σ=6.2), and the sample mean (x̄=49.02). Show more…
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