Researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. A sample of 16 men ages 18-20 (Group 1) were observed for weight loss using a diet only, and another independent sample of 14 men ages 18-20 (Group 2) were put on the same diet, but with an added exercise program. The mean weight loss for Group 1 was 7.7 pounds with a standard deviation of 4.6 pounds, and the mean weight loss for Group 2 was 14.5 pounds, with a standard deviation of 3 pounds. Calculate the test statistic for a test of the hypothesis that the mean weight loss for the two groups is the same. Give your answer to two decimal places.