Exhibit 9-2.The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership.The dealership has historically had 800 customers per day.The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750.Assume that the population standard deviation is 350. Refer to Exhibit 9-2.The population parameter to be tested is ___________.

Question

Quizplus · Accepted Answer

The population parameter to be tested in this scenario is the mean number of customers visiting the dealership per day. The owner wants to know if the financial crisis actually resulted in a decrease in the number of customers visiting the dealership, hence she needs to test whether the sample mean of 750 is significantly different from the historical population mean of 800. Therefore, the correct answer is C.