## Elementary Statistics (12th Edition)

$H_{0}:\sigma_1=sigma_2,$ $H_{a}:\sigma_1\$ is more than $\sigma_2$. :$F=\frac{s_1^2}{s_2^2}=\frac{22.6627^2}{17.0734^2}=1.7619.$ The critical values by the table with df=min(9,9)=9: $f_{0.05}$ is between 3.9639 and 4.102. If the value of the test statistic is in the rejection region, reject the null hypothesis. 1.7619 is less than 3.3639, hence we fail to reject the null hypothesis.