My question,123

1. 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 reported the force on the hand just after impact on a one-handed backhand drive for six advanced player and for eight intermediate players. See below for the sample statistics. n Type of Player Mean StDev 6 Advanced 40.3 11.3 Intermediate 21.4 8.3 Assume that both force distributions were normal. (i) Calculate an approximate 95% lower confidence bound for the difference between the true average forces for advanced players and true average force for intermediate players. 3 . (ii) What can you say about " Tennis elbow is thought to be aggravated by the impact experienced when hitting the ball" ? There is sufficient evidence that the time average han those for intermediate1. (20 points) Consider the Bertrand duopoly model with homogeneous products, Suppose that the quantity that consumers demand from i is a - p, when pi p,. and (a-p.)/2 when p, = p, Suppose also that there are no fixed costs and that marginal costs are constant at e, where c