Find the Critical Value or Values Of $\chi ^ { 2 }$

Find the critical value or values of $\chi ^ { 2 }$ based on the given information.
-Systolic blood pressure levels for men have a standard deviation of 19.7 mm Hg. A random sample of 31
women resulted in blood pressure levels with a standard deviation of 22.3 mm Hg. Use a 0.05 significance level
to test the claim that blood pressure levels for women have the same variation as those for men.