A medical researcher compares two studies that analyze the effectiveness of two new anti-cholesterol drugs In the study of pill X (population 1), 40 patients participated and had an average reduction of 23 points in their cholesterol level, with a standard deviation of 1A. In the other study, 30 patients received pill 2 (population 2) and had an average reduction of 21 points in their cholesterol level, with a standard deviation of 17. What is the value of the test statistic for testing : '2 Huzg2 =1\\'5.H1:%