A large utility company is considering two sites for locating a large scale wind energy conversion system (windmill). In selecting the site, both the average speed and variation in speed are important: the more consistent the winds speeds, the more efficient the energy conversion. The variability for the two sites is measured using a sample of 30 wind speed observations at each site. The summary data are given below:

Site 1 Site 2

Sample Size 30 30

Mean 12.2 mph 14.4 mph

Sample std. deviation 1.8 mph 2.62 mph

At the 10% level of significance, test whether the variability in wind speeds at the two sites is the same.