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# A Sample of 37 Light Bulbs Had a Mean Lifetime $579.2 < \mu < 588.8$

Question 11
Multiple Choice
Question 11
Multiple Choice

## A sample of 37 light bulbs had a mean lifetime of 584 hours. A 95 % confidence interval for the population mean was $579.2 < \mu < 588.8$Which one of the following statements is the correct interpretation of the results?

A) None of these are true.
B) 95 % of the light bulbs in the sample had lifetimes between 579.2 hours and 588.8 hours
C) The probability that the population mean is between 579.2 hours and 588.8 hours is 0.95 .
D) We are 95 % confident that the mean lifetime of all the bulbs in the population is between 579.2 hours and 588.8 hours.

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