Allied Corporation is trying to determine whether to purchase Machine A or B. It has leased the two machines for a month. A random sample of 5 employees has been taken. These employees have gone through a training session on both machines. The summary statistics are reported below. Is there evidence to suggest there is a difference in the productivity of the two machines? d= 56., sd= 3.36, nd=5

Let the difference d =Machine A - Machine B.

What would be an appropriate alternative hypothesis?
a. The population mean of the differences is 0
b. The population mean of the differences is greater than 0
c. The population mean of the differences is less than 0
d. The population mean of the differences is not equal to 0