In swimming, clearly you would like to swim fast, but swimming consistent times is also important. A survey of 34 swims by men on a local university's swim team found a variance of their swimming times was 6 seconds. A similar survey of 28 swims by swimmers at a different university found the variance was 9 seconds. When testing the hypothesis (at the 5% level of significance) that the variances are equal, what is the test statistic?