A machine is used to fill containers with a liquid product. Fill volume can be assumed to be normally distributed. A random sample of ten containers is selected and the net contents (oz) are as follows: 12.03, 12.01, 12.04, 12.02, 12.05, 11.98, 11.96, 12.02, 12.05 and 11.99.

a) Suppose that the manufacturer wants to be sure that the mean contents exceeds 12 oz. What conclusions can be drawn from the data (use a=0.01)?