A computer system administrator notices that computers running a particular operating system seem to freeze up more often as the installation of the operating system ages. She measures the time (in minutes) before freeze-up for seven computers one month after installation, and for nine computers seven months after installation. The results are as follows: One month after 207.4233.1215.9 install: 235.1225.6244.4 245.3 Seven months 84.3 53.2 127.3 after install: 201.3174.2246.2 149.4 156.4 103.3 Find a 95% confidence interval for the mean difference in time to freeze-up between the first month and the seventh.
A computer system administrator notices that computers running a particular operating system seem to freeze up more often as the installation of the operating system ages. She measures the time (in minutes) before freeze-up for seven computers one month after installation, and for nine computers seven months after installation. The results are as follows: One month after 207.4233.1215.9 install: 235.1225.6244.4 245.3 Seven months 84.3 53.2 127.3 after install: 201.3174.2246.2 149.4 156.4 103.3 Find a 95% confidence interval for the mean difference in time to freeze-up between the first month and the seventh.
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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Question
![A computer system administrator notices that computers running a particular operating
system seem to freeze up more often as the installation of the operating system ages. She
measures the time (in minutes) before freeze-up for seven computers one month after
installation, and for nine computers seven months after installation. The results are as
follows:
One month after 207.4233.1215.9
install:
235.1225.6244.4
245.3
Seven months
84.3 53.2 127.3
after install:
201.3174.2246.2
149.4 156.4 103.3
Find a 95% confidence interval for the mean difference in time to freeze-up between the
first month and the seventh.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe63a4372-8264-4f5b-8302-fbb9f7c12445%2Fe92bd422-0262-4487-bf39-94dc98a7d265%2Fdy60f7o.png&w=3840&q=75)
Transcribed Image Text:A computer system administrator notices that computers running a particular operating
system seem to freeze up more often as the installation of the operating system ages. She
measures the time (in minutes) before freeze-up for seven computers one month after
installation, and for nine computers seven months after installation. The results are as
follows:
One month after 207.4233.1215.9
install:
235.1225.6244.4
245.3
Seven months
84.3 53.2 127.3
after install:
201.3174.2246.2
149.4 156.4 103.3
Find a 95% confidence interval for the mean difference in time to freeze-up between the
first month and the seventh.
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