TABLE 9-1
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46 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 46 cases:

-Referring to Table 9-1, what critical value should the manager use to determine the rejection region?
A) 1.6794
B) 1.3011
C) 1.3006
D) 0.6800

Question

TABLE 9-1
Microsoft Excel was used on a set of data involving the number of defective items found in a random sample of 46 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 46 cases:
 
-Referring to Table 9-1, what critical value should the manager use to determine the rejection region?
A) 1.6794 
B) 1.3011 
C) 1.3006 
D) 0.6800

Quizplus · Accepted Answer

The critical value for a one-tailed test with a level of significance of 0.10 and 45 degrees of freedom (n-1 = 46-1) is 1.3006, according to Table 9-1. The manager is only interested in determining if the mean number of defective bulbs is greater than 20, so she should use a one-tailed test. Therefore, the answer is choice C.

TABLE 9-1 Microsoft Excel Was Used on a Set of Data Involving