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 for6

computers one month after installation and for6

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

1

denote the variability in time to freeze-up in the first month after installation. Use the=

0.05

level and the critical value method with the table.

One month:

244.4

245.3

207.4

233.1

215.9

235.1

Seven months:

246.2

149.4

156.4

103.3

84.3

53.2