A comparison of the precisions of two machines developed for extracting juice from oranges is to be made using the following data:

a. Is there sufficient evidence to indicate that there is a difference in the precision of the two machines at the 5% level of significance?
b. Find a 95% confidence interval for the ratio of the two population variances. Does this interval confirm your conclusion from part a? Explain.

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Machine A Machine B s2 3.1 ounces s2 1.4 ounces 25 = 25