Question

Use the confidence interval and the indicated sample data to calculate a confidence interval to estimate the population mean.

SD = standard deviation

a) Salaries of university graduates who took a course in statistics at the university: 95% confidence, n = 41, mean = $ 67, 200, and the standard deviation is known to be $ 18,277.

B) The speeds of drivers fined in a speed limit zone of 55 mi / h: 95% confidence, n = 90, mean = 66.2 mi / h, and it is known that the standard deviation is 3.4 mi / h.

c) FICO credit scores of credit card applicants: 99% confidence, n = 70, mean = 688, and the standard deviation is known to be 68.

D) amounts lost by players who took a bus to an Atlantic city casino: 99% confidence; n = 40, mean = $ 189, and the standard deviation is known to be $ 87.

Answer 1

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