4. Two groups of students were trained on their vertical jump ability using two different weight training methods. Group one used free weights and group two used weight machines. After the same period of training, the increasing values of the vertical jump tests are: Group one: 4.2, 4.3, 2.l, 2.3, 1.2, 5.4, 3.4, 3.], 5.3 Group two: 5.2, 5.1, 4.3, 4.2, 2.5, 2.8, 3.9, 3.9, 2.7, 3.8, 3.3 What t-test is used? How many df are there? What are the means? What are the sds? What is the alpha level? One or two-tailed test? What is the t value? What is the p value? What is the interpretation of the test