Find and Interpret the Confidence Interval

question 15

Multiple Choice

Find and interpret the confidence interval.
-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 the company's electrical components. The Quality Control
Department plans to check a random sample of the over 10,000 electrical components
Manufactured across all divisions. The resulting 95% confidence interval based on these
Data is .0758 to .1339. Which of the following is the correct interpretation?

• A) The percentage of electronic components that are reworked is between 7.6% and
• B) We are 95% confident that between 7.6% and 13.4% of electrical components are reworked.
• C) The margin of error for the true percentage of electrical components that are reworked is between 7.6% and 13.4%.
• D) All samples of size 450 will yield a percentage of reworked electrical components that falls within 7.6% and 13.4%.
• E) None of the above.