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.∑ ꭓ = 205 ∑ (ꭓ - x̄) ² = 56.43Calculate the sample mean x̄ Calculate the sample standard deviation.Using the p value approach at the 1% level of significance, test whether the mean duration of long-distance calls from the town had increased.Construct the 99% confidence interval for the population mean duration of the long distance calls from the town.

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Description: 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 fr

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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 long-distance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes.

∑ ꭓ = 205 ∑ (ꭓ - x̄) ² = 56.43

Calculate the sample mean x̄
Calculate the sample standard deviation.
Using the p value approach at the 1% level of significance, test whether the mean duration of long-distance calls from the town had increased.
Construct the 99% confidence interval for the population mean duration of the long distance calls from the town.

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