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

question 23

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.

---

Definitions:

Complete Unit

A single item that is ready for sale or use, containing all its necessary parts or components.

Standard Account Forms

Preset templates used for recording financial transactions and keeping track of financial information in accounting.

Entry

A record of a financial transaction in an accounting system.

Gross Increases

Refers to the total increment in volume or quantity before any deductions like taxes or expenses are applied.