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# Two different types of alloy, A and B, have been used to manufacture experimental

ISBN: 9781305251809 122

## Solution for problem 57 Chapter 9.4

Probability and Statistics for Engineering and the Sciences | 9th Edition

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Problem 57

Two different types of alloy, A and B, have been used to manufacture experimental specimens of a small tension linkto be used in a certain engineering application. The ultimatestrength (ksi) of each specimen was determined, and theresults are summarized in the accompanying frequency distribution. A B26 2 , 30 6 430 2 , 34 12 934 2 , 38 15 1938 2 , 42 7 10m 5 40 m 5 42Compute a 95% CI for the difference between the true proportions of all specimens of alloys A and B that havean ultimate strength of at least 34 ksi

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