12.43 Refer to Exercise 12.31. a Use a 99% confidence interval to estimate the difference between the

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12.43 Refer to Exercise 12.31.

a Use a 99% confidence interval to estimate the difference between the mean delivery times for carriers I and II.

b What assumptions are necessary for the validity of the procedures you used in part (a)?

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Probability And Statistics For Engineers

ISBN: 9781133006909

5th Edition

Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr

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