A manufacturing firm has been averaging 18.2 orders per week for several years. However, during recession orders appeared to slow. Suppose the firm's production manager randomly samples 32 weeks and...

Extracted text: A manufacturing firm has been averaging 18.2 orders per week for several years. However, during recession orders appeared to slow. Suppose the firm's production manager randomly samples 32 weeks and finds a sample mean of 15.6 orders. The population standard deviation is 2.3 orders. Test to determine whether the average numbers of orders is down by using a = 0.05, critical value = +1.96