8.A fast food restaurant is considering a new product. It will be worthwhile to introduce this product if the mean sales per store are more than $600 per week. In a marketing test the product is sold at 26 stores. From the sample it is found that the mean for weekly sales is $603.20 and the standard deviation is $60. The hypotheses that the restaurant should test before making a decision are:

A.H₀: Xbar = 600,H_A: Xbar does not equal 600

B.H₀: = 600,H_A: does not equal 600

C.H₀: 600,H_A: < 600

D.H₀: 600,H_A: > 600