Orange Juice: A comparison of the precisions of two machines developed for extracting juice from organs is to be made using the following data: Machine A Machine B s= = 3.1 ounces? s = 1.4 ounces? n = 25 n = 25 a. (5pts) Is there sufficient evidence to indicate that there is a difference in the precision of the two machines at the a - 5% level of significance? b. (5pts) Find a 95 %confidence interval for the ratio of the two population variances. Does this interval confirm your conclusion from part a? Explain