Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The mean tread wear was 50,000 miles, with a standard deviation of 3,500 miles. What is the best estimate of the average 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

The best estimate for the average tread life in miles for the whole population of tires is the sample mean, which is 50,000 miles. This is because the sample is randomly selected and a good representation of the population, and the standard deviation is relatively low at 3,500 miles, indicating that the data points are not too spread out. Therefore, the best estimate of the population mean is the sample mean.

Mileage Tests Were Conducted on a Randomly Selected Sample of 100