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(a) (b) (c) Write the null hypothesis, alternative hypothesis and claim for X. Determine the test types and data. Calculate the critical value and the test statistics.

(a) (b) (c) Write the null hypothesis, alternative hypothesis and claim for X. Determine the test types and data. Calculate the critical value and the test statistics.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Q3 11kV SF6 circuit breakers in electrical distribution substations in an industrial park must be periodically maintained to prevent unexpected faults. An engineer claims that on average, the circuit breakers will fail less than 10 months after the last maintenance work due to the surrounding atmospheric conditions. Based on his claim, he suggests to reduce preventive maintenance cycle time. From a sample of 30 circuit breakers, the mean operating hours before circuit breaker failure is 6845 hours with a standard deviation of 766 hours. Let X is the average operating hours before fail and a=0.05. Assume 30 days per month in the calculation. (a) Write the null hypothesis, alternative hypothesis and claim for X. (b) (c) Determine the test types and data. Calculate the critical value and the test statistics.
Transcribed Image Text:Q3 11kV SF6 circuit breakers in electrical distribution substations in an industrial park must be periodically maintained to prevent unexpected faults. An engineer claims that on average, the circuit breakers will fail less than 10 months after the last maintenance work due to the surrounding atmospheric conditions. Based on his claim, he suggests to reduce preventive maintenance cycle time. From a sample of 30 circuit breakers, the mean operating hours before circuit breaker failure is 6845 hours with a standard deviation of 766 hours. Let X is the average operating hours before fail and a=0.05. Assume 30 days per month in the calculation. (a) Write the null hypothesis, alternative hypothesis and claim for X. (b) (c) Determine the test types and data. Calculate the critical value and the test statistics.
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