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Hypothesis Test of Mean Repair Time

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A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machinery has been frequently failing and requiring repairs and service. The company has been able to provide its customers with a completion time of 6 days or less. To analyze whether the completion time has increased, the production manager took a sample of 36 jobs and found that the sample mean completion time was 6.5 days with a sample standard deviation of 1.5 days. At a significance level of .10, test whether the completion time has increased.

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Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis. Formula for the calculation and interpretations of the results are also included.

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H0 :The company has been able to provide its customers with a completion time of 6 days or less
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