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 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: iv. State the decision rule. v. Give your decision based on the available sample evidence. vi. Hence, state your conclusion.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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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
randomly selected and tne mean duration was 10.2 minures with standard deviation 4.8
minutes.
a) Using a 1% level of significance, Complete the following:
iv. State the decision rule.
v. Give your decision based on the available sample evidence.
vi. Hence, state your conclusion.
Transcribed Image Text: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 randomly selected and tne mean duration was 10.2 minures with standard deviation 4.8 minutes. a) Using a 1% level of significance, Complete the following: iv. State the decision rule. v. Give your decision based on the available sample evidence. vi. Hence, state your conclusion.
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