Page 24 of 37 randomly selected and the mean duration was 10.2 minutes with standard deviation 4.8 minutes. a) Using a 1% level of significance, Complete the following: i. Give the null and alternative hypothesis of this test.

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Question 2 
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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 – Course Information. Academic Year 2021/2022, Semester I
Page 24 of 37
randomly selected and the mean duration was 10.2 minutes with standard deviation 4.8
minutes.
a) Using a 1% level of significance, Complete the following:


i. Give the null and alternative hypothesis of this test. 

Expert Solution
Step 1

We have given that 

Mean=x̅=10.2

Standard deviation=S=4.8

μ=9.8

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