The manager of the local health club is interested in determining the number of times members use the weight room per month.She takes a random sample of 15 members and finds that over the course of a month,the average number of visits was 11.2 with a standard deviation of 3.2.Assuming that the monthly number of visits is normally distributed,which of the following represents a 95% confidence interval for the average monthly usage of all health club members?
A)11.2 ± 1.74
B)11.2 ± 1.77
C)11.2 ± 1.62
D)11.2 ± 1.83

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The Answer of The manager of the local health club is interested in determining the number of times members use the weight room per month.She takes a random sample of 15 members and finds that over the course of a month,the average number of visits was 11.2 with a standard deviation of 3.2.Assuming that the monthly number of visits is normally distributed,which of the following represents a 95% confidence interval for the average monthly usage of all health club members?
A)11.2 ± 1.74
B)11.2 ± 1.77
C)11.2 ± 1.62
D)11.2 ± 1.83

The Manager of the Local Health Club Is Interested in Determining