57. An automobile company is working on changes in a fuel injection system to improve gasoline...
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57. An automobile company is working on changes in a fuel injection system to improve gasoline mileage. A random sample of 15 test runs gives the following mileage (in miles per gallon): 38 42 40 39 44 37 39 45 40 42 38 39 44 41 42 a. Find a two-sided 90% confidence interval for the mean gasoline mileage. State the assump- tions necessary to find the confidence interval. b. The mean miles-per-gallon rating when using the previous fuel injection system was 35. Can we conclude that the new system has im- proved gasoline mileage? Use a level of sig- nificance of .01. 57. An automobile company is working on changes in a fuel injection system to improve gasoline mileage. A random sample of 15 test runs gives the following mileage (in miles per gallon): 38 42 40 39 44 37 39 45 40 42 38 39 44 41 42 a. Find a two-sided 90% confidence interval for the mean gasoline mileage. State the assump- tions necessary to find the confidence interval. b. The mean miles-per-gallon rating when using the previous fuel injection system was 35. Can we conclude that the new system has im- proved gasoline mileage? Use a level of sig- nificance of .01.
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Related Book For
Introduction to Probability and Statistics
ISBN: 978-1133103752
14th edition
Authors: William Mendenhall, Robert Beaver, Barbara Beaver
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