Wilson Construction and Concrete Company is known as a very progressive company that is willing to try
Question:
a. Use these sample data to construct a 90% confidence interval estimate for the difference in mean setup time for the two concrete additives. On the basis of the confidence interval produced, do you agree that the new additive helps reduce the setup time for cement? (Assume the populations are normally distributed.) Explain your answer.
b. Assuming that the new additive is slightly more expensive than the old additive, do the data support switching to the new additive if the managers of the company are primarily interested in reducing average setup time?
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Related Book For
Business Statistics A Decision Making Approach
ISBN: 9780133021844
9th Edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry
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