A microwave manufacturing company has just switched to a new automated production system. Unfortunately, the new machine
Posted: Wed Dec 15, 2021 10:35 am
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 25 jobs and
found that the sample mean completion time was 6.4 days with a
sample standard deviation of 1.5 days. At a significance level of
0.01, test whether the completion time has increased. (Form the
hypotheses, show the critical and calculated values of the test
statistic and perform the test)
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 25 jobs and
found that the sample mean completion time was 6.4 days with a
sample standard deviation of 1.5 days. At a significance level of
0.01, test whether the completion time has increased. (Form the
hypotheses, show the critical and calculated values of the test
statistic and perform the test)