Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 56 cases of light bulbs produced during a morning shift at a plant. A manager wants to know if the mean number of defective bulbs per case is greater than 20 during the morning shift. She will make her decision using a test with a level of significance of 0.10. The following information was extracted from the Microsoft Excel output for the sample of 56 cases: n = 56; ; S = 20; ; Test Statistic = 1.5; Critical Value = 1.282. Decision = Reject . The parameter the manager is interested in is:

Question

Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 56 cases of light bulbs produced during a morning shift at a plant. A manager wants to know if the mean number of defective bulbs per case is greater than 20 during the morning shift. She will make her decision using a test with a level of significance of 0.10. The following information was extracted from the Microsoft Excel output for the sample of 56 cases: n = 56; ; S = 20; ;  Test Statistic = 1.5;  Critical Value = 1.282. Decision = Reject . The parameter the manager is interested in is:

the mean number of defective light bulbs per case produced at the plant.

the mean number of defective light bulbs per case among the 56 cases.

the mean number of defective light bulbs per case produced during the morning shift.

the proportion of cases with defective light bulbs produced at the plant.

GPT-4o mini · Answer

The parameter the manager is interested in is:

the mean number of defective light bulbs per case produced during the morning shift.

This is because the investigation is focused on whether the mean number of defective bulbs exceeds a certain threshold specifically for the morning shift production.