A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below. The pooled standard deviation is 12.04.
| Regular Exercise |
N |
Mean |
| Yes |
35 |
48.5 |
| No |
120 |
56.9 |
Researchers believe there is a difference between men who exercise and those who do not. What is the appropriate critical value to run a hypothesis test at the alpha level=0.05?