A manager of a cafeteria wants to estimate the average time customers wait before being served. A random sample of 49 customers has an average waiting time of 8.4 minutes with a standard deviation of 3.5 minutes. Find a 90% confidence interval for the true average customer waiting time. O (8.21, 8.56) (8.26, 8.54) (7.58, 9.23) O (8.33, 8.47)
A manager of a cafeteria wants to estimate the average time customers wait before being served. A random sample of 49 customers has an average waiting time of 8.4 minutes with a standard deviation of 3.5 minutes. Find a 90% confidence interval for the true average customer waiting time. O (8.21, 8.56) (8.26, 8.54) (7.58, 9.23) O (8.33, 8.47)
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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Transcribed Image Text:A manager of a cafeteria wants to estimate the average time customers wait before being served. A random
sample of 49 customers has an average waiting time of 8.4 minutes with a standard deviation of 3.5 minutes.
Find a 90% confidence interval for the true average customer waiting time.
O (8.21, 8.56)
(8.26, 8.54)
(7.58, 9.23)
(8.33, 8.47)
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