Question: Computer crashes: A computer system administrator notices that computers running a particular operating system seem to crash more often as the installation of the operating

Computer crashes: 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 five computers one month after installation, and for six computers seven months after installation. The results are as follows: One month after installation 209 221 230 243 247 Seven months after installation 59 105 129 176 201 149 Construct an 80 % confidence interval for the mean difference in time to crash between the first month after installation and the seventh. Let ul denote the mean time to crash one month after installation. Use the TI-84 calculator and round the answers to one decimal place. An 80 % confidence interval for the mean difference in time to crash between the first month after installation and the seventh is

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