Problem-1 in order to estimate the difference between the average miles per gallon of two different models of automobiles, samples are taken, and the following information is collected. model a model b sample size 50 55 sample mean 32 35 sample variance 9 10 a) at 95% confidence develop an interval estimate for the difference between the average miles per gallon for the two models. b) is there conclusive evidence to indicate that one model gets a higher mpg than the other? why or why not? explain.