26. Tennis elbow is thought to be aggravated by the impact experienced when hitting the ball. The article Forces on the Hand in the Tennis One-Handed Backhand (Internat. J. Sport Biomechanics, 1991:

282—292) reported the force (N) on the hand just after impact on a one-handed backhand drive for six advanced players and for eight intermediate players.
Type of Sample Sample Sample Player Size Mean SD 1. Advanced 6 40.3 11.3 2. Intermediate 8 21.4 8.3 In their analysis of the data, the authors assumed that both force distributions were normal. Calculate a 95% CI for the difference between true average force for advanced players (m1) and true average force for intermediate players (m2). Does your interval provide compelling evidence for concluding that the two m s are different? Would you have reached the same conclusion by calculating a CI for m2  m1 (i.e., by reversing the 1 and 2 labels on the two types of players)? Explain.