A random sample of 25 women resulted in systolic blood pressure levels with a mean of 115 and a standard deviation of 2.1. A random sample of 61 men resulted in systolic blood pressure levels with a mean of 149 and a standard deviation of 6. Use a 0.05 significance level and the critical value method to test the claim that blood pressure levels for men vary more than blood pressure levels for women.

Enter the smallest critical value. (Round your answer to nearest ten-thousandth.)