Company A has implemented new technologies to decrease the manufacturing cost of products. The old cost was $5.6 per unit. In order to find out whether the new technologies are effective or not, we decided to perform a hypothesis test at the significance level of 0.05. We collected a sample of 36 products and found the average cost is $5.5, and the sample standard deviation of the cost is $1.2. Please first choose the correct set of hypotheses and then choose the correct test statistics. HO:mean > 5.6 H1: mean 5.6 HO: mean >= 5.6 H1: mean = 5.6 HO: mean 5.6 H1: mean - 5.6