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A random sample of 100 long-distance calls gives a mean of 15 minutes and standard deviation 20 minutes. A 95% confidence interval for the average
A random sample of 100 long-distance calls gives a mean of 15 minutes and standard deviation 20 minutes. A 95% confidence interval for the average length of long-distance calls is closest to
- (11.71, 18.29)
- (10.55, 20.65)
- (11.08, 18.92)
- (11.5, 18.5)
- (10.63, 20.25)
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Microeconomics Principles, Problems, And Policies
Authors: Campbell McConnell
21st Edition
1259915727, 9781259915727
