a The mean and standard deviation of a sample of
a. The mean and standard deviation of a sample of 100 is x̄ = 1500 and s = 300. Estimate the population mean with 95% confidence.
b. Repeat part (a) with s = 200.
c. Repeat part (a) with s = 100.
d. Discuss the effect on the confidence interval estimate of decreasing the standard deviation s.

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