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2. 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 long-distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. Σ?=205                         Σ(?−?̅)2=56.43 d) Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town

2. 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 long-distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. Σ?=205                         Σ(?−?̅)2=56.43 d) Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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2. 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 long-distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes.


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

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

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