In 2015, the average duration of long-distance telephone calls from a certain town was 9.4 minutes. A telephone company wants to perform a test to determine whether this average duration of long-distance calls has changed. Twenty calls, originating from the town, was Course Name and Code –randomly selected and the mean duration was 10.2 minutes with a standard deviation of 4.8 minutes.a) Using a 1% level of significance, Complete the following:Give the null and alternative hypotheses of this test.] ii. Determine the critical value(s) of this test.iii. Compute the value of the test statisticState the decision ruleGive your decision based on the available sample evidence.] vi. Hence, state your conclusion.] b) Construct the 99% confidence interval for the population mean duration of the long-distance calls from the town

We have given that Sample size n=20 , mean (xbar)=10.2 s= 4.8 ,alpha =0.01 Note:-According to…

Answered: In 2015, the average duration of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In 2015, the average duration of long-distance telephone calls from a certain town was 9.4 minutes. A telephone company wants to perform a test to determine whether this average duration of long-distance calls has changed. Twenty calls, originating from the town, was Course Name and Code –randomly selected and the mean duration was 10.2 minutes with a standard deviation of 4.8 minutes.