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Based on a random sample of size 75, you observe a sample mean of 85.63 and a sample standard deviation of 19.71. Which of the

Based on a random sample of size 75, you observe a sample mean of 85.63 and a sample standard deviation of 19.71. Which of the following are the endpoints of a 90% confidence interval for the population mean? (Because of potential roundoff, choose the closest.)

a. 81.84 to 89.42
b. 82.69 to 88.57
c. 79.61 to 91.65

d. 81.10 to 90.16

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