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

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

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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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? а. 11.2 + 1.83 O b. 11.2 1.74 Ос. 11.2 + 1.77 d. 11.2 + 1.62
Transcribed Image Text: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? а. 11.2 + 1.83 O b. 11.2 1.74 Ос. 11.2 + 1.77 d. 11.2 + 1.62
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