Question 2 (20 points) Two models of batteries are measured for their discharge time (in hours): Model A 5.5 5.6 6.3 4.6 5.3 5.0 6.2 5.8 5.1 5.2 5.9 Model B 3.8 4.3 4.2 4.0 4.9 4.5 5.2 4.8 4.5 3.9 3.7 4.6 Assume that the discharge times of Model A follows a normal distribution N(#1, o?), and the discharge times of Model B follows a normal distribution N(#2, o?). (a) Suppose the variances from the two models are the same, at significant level o = 0.01, can we assert that Model A lasts longer than Model B? (b) At o = 0.05, test if the two samples have the same variance