To determine which muscles need to be subjected to a conditioning program in order to improve one's performance on the flat serve used in tennis, a study was conducted by the Department of Health, Physical Education and Recreation at the Virginia Polytechnic Institute and State University. Five different were tested on each of 3 subjects, and the experiment was carried out 3 times for each treatment combination. The electromyographic data, recorded during the serve, are presented here. Use a 0.01 level of significance to test the hypothesis that(a) Different subjects have equal electromyographic measurements:(b) Different muscles have no effect on electromyographic measurements;(c) Subjects and types of muscle do notinteract.

1: anterior deltoid 4: middle deltoid 5: triceps 2: pectorial major 3: posterior deltoid Muscle 4- 5 Subject 32 5 58 10 19 1.5 61 10 20 2 66 14 23 59 38 2 63 10 64 45 43 60 50 9. 78 61 61 7 78 71 42 43 41 26 63 61 54 43 29 46 85 47 42 23 55 95 2. 3.