Question 2 n 2015, the average duration of long-distance telephone calls from a certain town vas 3.9 minutes. A telephone company wants to perform a test to determine whether this average luration of longdistance calls has changed. Fifty calls, originating from the town, vas randomly selected and the Following summary minutes. Σχ-205 Σ (x- x) 2 = 56.43 -) Calculate the sample mean, x. ) Calculate the sample standard deviation ) Using the p value approach at the 1% level of significance, test whether the nean duration of ong-distance calls from the town had increased. ) Construct the 99% confidence interval for the population mean duration of the ong-distance calls from the town.

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Question 2
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.
Σx= 205 Σ (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 the
long-distance calls from the town.
Transcribed Image Text:Question 2 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. Σx= 205 Σ (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 the long-distance calls from the town.
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