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.
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.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Please answer c & d
![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1680d3e7-b38a-4c0e-96f4-caebab5b053f%2Fe39b5ffd-4eb7-4dc1-ab42-41d27b3b7503%2Fep90n65_processed.jpeg&w=3840&q=75)
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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