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# Answer: The specification for the pull strength of a wire that connects an integrated

ISBN: 9780073401331 38

## Solution for problem 3 Chapter 5.5

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition

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Problem 3

The specification for the pull strength of a wire that connects an integrated circuit to its frame is 10 g or more. In a sample of 85 units made with gold wire, 68 met the specification, and in a sample of 120 units made with aluminum wire, 105 met the specification. Find a 95% confidence interval for the difference in the proportions of units that meet the specification between units with gold wire and those with aluminum wire.5320 patients received bare metal stents, and of these, 841 needed treatment for reblocking within a year. A total of 1120 received drug coated stents, and 134 of them required treatment within a year. a. Find a 98% confidence interval for the differences between the proportions for drug coated stents and bare metal stents. b. Suppose that additional patients are to be treated in order to increase the precision of the confidence interval. Three sampling plans are being considered. In the first plan, 1000 additional patients will be treated with bare metal stents. In the second plan, 500 additional patients will be treated with drug coated stents. In the third plan, 500 additional patients will be treated with bare metal stents and 250 additional patients will be treated with drug coated stents. Which plan is most likely to provide the greatest increase in the precision of the confidence interval? Explain.

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Week one Lecture #1 Chapter 3- Section 3.3 What is Statistics- Statistics is the branch of mathematics that deals with the collections Population vs. Sample Population: entire group of entities that we want information about Sample: Part of the population that we actually examine in order to gather info Census:...

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