A sample of size n = 80 is drawn from a normal population whose standard deviation is σ = 6.8. The sample mean is x̄ = 40.41. a. Construct a 90% confidence interval for μ. b. If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain.

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A sample of size n = 80 is drawn from a normal population whose standard deviation is σ = 6.8. The sample mean is  = 40.41.

a.

Construct a 90% confidence interval for μ.

b.

If the population were not approximately normal, would the confidence interval constructed in part (a) be valid? Explain.

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