A computer system administrator notices that computers running a particular operating system seem to crash more often
Question:
A computer system administrator notices that computers running a particular operating system seem to crash more often as the installation of the operating system ages. She measures the time (in minutes) before crash for seven computers one month after installation, and for nine computers seven months after installation. The results are as follows:
a. Explain why it is necessary to check whether the populations are approximately normal before constructing a confidence interval.
b. Following are dotplots of these data. Is it reasonable to assume that the populations are approximately normal?
c. If appropriate, construct a 95% confidence interval for the mean difference in time to crash between the first month after installation and the seventh. If not appropriate, explain why not.
Step by Step Answer:
