Hot dogs, second helping The Consumer Reports article described in Exercise 51 also listed the fat content (in grams)

for samples of beef and meat hot dogs. The resulting 90% confidence interval for mMeat - mBeef is ( -6.5, -1.4).

a) The endpoints of this confidence interval are negative numbers. What does that indicate?

b) What does the fact that the confidence interval does not contain 0 indicate?

c) If we use this confidence interval to test the hypothesis that mMeat - mBeef = 0, what’s the corresponding alpha level?