SCENARIO 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:
-True or False: Referring to Scenario 9-1, the evidence proves beyond a doubt that the mean
number of defective bulbs per case is greater than 20 during the morning shift.

Question

SCENARIO 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: 
-True or False: Referring to Scenario 9-1, the evidence proves beyond a doubt that the mean
number of defective bulbs per case is greater than 20 during the morning shift.

Quizplus · Accepted Answer

The statement claims that the evidence proves "beyond a doubt," which implies absolute certainty. In statistics, conclusions are typically based on a level of confidence, not absolute certainty. Therefore, unless the scenario explicitly states a 100% confidence level, the claim is false.

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