Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The results showed that the mean tread life was 50,000 miles,with a standard deviation of 3,500 miles. What is the best estimate of the mean tread life in miles for the entire population of these tires?
A)50,000
B)3,500
C)500
D)35

Question

Quizplus · Accepted Answer

Since the sample was randomly selected and the sample size is relatively large (n=100), it can be assumed that the sample is representative of the population. Therefore, the mean tread life of the sample (50,000 miles) can be used as the best estimate of the mean tread life for the entire population of these tires.

Mileage Tests Were Conducted on a Randomly Selected Sample of 100