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In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes. A telephone company wants to perform a test to determine whether this average duration of longdistance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes.                                                               ∑ ? = 205                    ∑(? − ?̅)2 = 56.43   Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town.

In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes. A telephone company wants to perform a test to determine whether this average duration of longdistance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes.                                                               ∑ ? = 205                    ∑(? − ?̅)2 = 56.43   Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town.

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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In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes. A telephone company wants to perform a test to determine whether this average duration of longdistance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes.

                                                              ∑ ? = 205                    ∑(? − ?̅)2 = 56.43

 

  1. Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town.                                                    
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