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A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new...

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Basic Math

A microwave manufacturing company has just switched to a newautomated production system. Unfortunately, the new machinery hasbeen frequently failing and requiring repairs and service. Thecompany has been able to provide its customers with a completiontime of 6 days or less. To analyze whether the completion time hasincreased, the production manager took a sample of 36 jobs andfound that the sample mean completion time was 6.5 days with asample standard deviation of 1.5 days.

a) At a significance level of 0.10, test whether the completiontime has increased.

b) Find and interpret a 99% confidence interval for the meancompletion time.

Answer & Explanation Solved by verified expert
4.3 Ratings (799 Votes)
a Below are the null and alternative Hypothesis Null Hypothesis 6 Alternative Hypothesis 6 Rejection Region This is right tailed test for 01 and df 35 Critical    See Answer
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