Question: A sample of size n = 89 has sample mean x = 87.2 and sample standard deviation s = 5.3. a. Construct a 95% confidence

A sample of size n = 89 has sample mean ̄x = 87.2 and sample standard deviation s = 5.3.

a. Construct a 95% confidence interval for the population mean σ.

b. If the confidence level were 99%, would the confidence interval be narrower or wider?

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