For numbers 18 to 21: A study was conducted using 50 undergraduates at a large private university who volunteered to participate in the research as partial fulfillment of a course requirement. One of...

What is the test statistics? From the problem in the picture

Extracted text: For numbers 18 to 21: A study was conducted using 50 undergraduates at a large private university who volunteered to participate in the research as partial fulfillment of a course requirement. One of the items studied was the maximum daily amount of alcohol consumed in the last month. Base on the data in the following table, are there differences between males and females in the maximum amount of alcohol consumed in any one day in the past month? Use 5 % level of significance. Assume equal variances. Alcohol consumed Male female Mean 8.2 5.6 Standard deviation 5.9 5.7 Number of students 20 30