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The mean time required to repair breakdowns of a certain copying machine is 93 minutes. The company which manufactures the machines claims that breakdowns of its new, improved model are easier to fix. To test this claim, a sample of 18 breakdowns of the new model were observed, resulting in a mean repair time of 88.8 minutes and a standard deviation of 16.6 minutes. Use significance level a = 0.05. State clearly what are your null and alternative hypotheses, show your work, and state your conclusion

The mean time required to repair breakdowns of a certain copying machine is 93 minutes. The company which manufactures the machines claims that breakdowns of its new, improved model are easier to fix. To test this claim, a sample of 18 breakdowns of the new model were observed, resulting in a mean repair time of 88.8 minutes and a standard deviation of 16.6 minutes. Use significance level a = 0.05. State clearly what are your null and alternative hypotheses, show your work, and state your conclusion

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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The mean time required to repair breakdowns of a certain copying machine is 93 minutes. The company which manufactures the machines claims that breakdowns of its new, improved model are easier to fix. To test this claim, a sample of 18 breakdowns of the new model were observed, resulting in a mean repair time of 88.8 minutes and a standard deviation of 16.6 minutes. Use significance level a = 0.05. State clearly what are your null and alternative hypotheses, show your work, and state your conclusion
Transcribed Image Text:The mean time required to repair breakdowns of a certain copying machine is 93 minutes. The company which manufactures the machines claims that breakdowns of its new, improved model are easier to fix. To test this claim, a sample of 18 breakdowns of the new model were observed, resulting in a mean repair time of 88.8 minutes and a standard deviation of 16.6 minutes. Use significance level a = 0.05. State clearly what are your null and alternative hypotheses, show your work, and state your conclusion
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I think H1 here should be mean < 93

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