Consider the following to answer the question(s) below:
One division of a large defense contractor manufactures telecommunication equipment for the military. This division reports that 12% of non-electrical components are reworked. Management wants to determine if this percentage is the same as the percentage rework for electrical components manufactured by the entire company. The Quality Control Department plans to check a random sample of the over 10,000 electrical components manufactured across all divisions.
-They actually select a random sample of 450 electrical components and find that 46 of those had to be reworked. The 99% confidence interval is
A) 0.0654 to 0.1390.
B) 0.0432 to 0.1608.
C) 0.0763 to 0.1277.
D) 0.0541 to 0.1499.
E) Cannot be determined with the given information.

Question

Quizplus · Accepted Answer

The 99% confidence interval is 0.0654 to 0.1390. This means that we are 99% confident that the true percentage of electrical components that are reworked is between 6.54% and 13.90%.

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