The factory building manager atDelectable Delights, Jason Short, is concerned that the newcontractor he hired is taking too long to replace defective lightsin the factory workspace. He would like to perform a hypothesistest to determine if the replacement time for the lights under thenew contractor is in fact longer than the replacement time underthe previous contractor, which was 3.2 days on average. He selectsa random sample of 12 service calls to replace defective lights andobtains the following times to replacement (in days). Use asignificance level of 0.05.
6.2 7.1 5.4 5.5 7.5 2.6 4.3 2.9 3.7 0.7 5.6 1.7
Define ? in the context of the problem and state theappropriate hypotheses. (5 pts)
Regardless of your results in Part B, calculate the appropriatetest statistic by hand. Write out all your steps.(5 pts)
- What is your decision regardingthe null hypothesis? (In other words, do you reject orfail to reject and why?) (5 pts)
Write a final concluding statement to Jason giving the resultsof the hypothesis test. (In other words, write the final summarystatement.) (5 pts)
