Question is in the picture as the equation is not able to upload. In 2015, the average duration of long-distance telephone calls from a certain town was 3.9minutes. A telephone company wants to perform a test to detemine whether this averageduration of longdistance calls has changed. Fifty calls, originating from the town, was randomlyselected and the following summary minutes.Σx= 205E(x - x)? = 56.43a) Calculate the sample mean, x.b) Calculate the sample standard deviationc) Using the p value approach at the 1% level of significance, test whether the mean duration oflong-distance calls from the town had increased.d) Construct the 99% confidence interval for the population mean duration of the long-distancecalls from the town.

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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 longdistance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. Σr= 205 E(x – x)² = 56.43 a) Calculate the sample mean, x. b) Calculate the sample standard deviation c) 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. d) Construct the 99% confidence interval for the population mean duration of thelong-distance calls from the town.

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 longdistance calls has changed. Fifty calls, originating from the town, was randomly selected and the following summary minutes. Σr= 205 E(x – x)² = 56.43 a) Calculate the sample mean, x. b) Calculate the sample standard deviation c) 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. d) Construct the 99% confidence interval for the population mean duration of thelong-distance calls from the town.

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Question is in the picture as the equation is not able to upload.

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 detemine whether this average
duration of longdistance calls has changed. Fifty calls, originating from the town, was randomly
selected and the following summary minutes.
Σx= 205
E(x - x)? = 56.43
a) Calculate the sample mean, x.
b) Calculate the sample standard deviation
c) 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.
d) Construct the 99% confidence interval for the population mean duration of the long-distance
calls from the town.

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