A computer system administrator noticed 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 computers one month after installation and for computers seven months after installation. The results are shown. Can you conclude that the time to freeze-up is less variable in the seventh month than the first month after installation? Let SD 1 denote the variability in time to freeze-up in the first month after installation. Use the a= 0.01 level and the critical value method with the table.

One month 207.4 233.1 215.9 235.1 225.6 244.4

Seven months 156.4 103.3 84.3 53.2 127.3 201.3

State the null and alternative hypothesis

This is a what kind of test? left tailed right taile or two tailed?