The owner of a large dealership believes that the financial

The owner of a large 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 fines the average number of customers visiting the dealership per day was 750. Assume that the population standard deviation is 350. At a 5% significance level the critical value(s) is (are) __________.

1.645

-1.645

-1.96 and 1.96

-2.030 and 2.030

Solution

Critical Value, It is a left tailed test
The Value of |Z | at LOS 0.05% is -1.645