A sample of 44 light bulbs had a mean lifetime of 544 hours. A 95% confidence in
ID: 3159863 • Letter: A
Question
A sample of 44 light bulbs had a mean lifetime of 544 hours. A 95% confidence interval for the population mean was 537.2<u<550.8 . Which one of the following statements is the correct interpretation of the results? A) 95% of the light bulbs in the sample had lifetimes between 537.2 hours and 550.8 hours B) The probability that the population mean is between 537.2 hours and 550.8 hours is 0.95 C) We are 95% confident that the mean lifetime of all the bulbs in the population is between 537.2 hours and 550.8 hours D) None of these are true.
Explanation / Answer
Answer: C
We are 95% confident that the mean lifetime of all the bulbs in the population is between 537.2 hours and 550.8 hours