Question

According to IHS Automotive, the average age of all U.S. cars on the road is 11.5 years. Dr. Wiley doesn't know this, but on his own he decides to try to figure out the average age of all U.S. cars on the road, so he randomly samples 75 U.S. cars on the road and gets the following 95% confidence interval:

7.6 years < μ < 11.7 years.  

What is the probability that his 95% confidence interval captured the true population average?

1

.05

0

.95

Answer 1

What is the probability that his 95% confidence interval captured the true population average?

Answer: .95

Explanation:

We know that the interpretation of the confidence interval with confidence level suggest that the probability of population mean being included in the interval is equal to the confidence level.