Use the following information for all questions on this page.A physician wants to compare the blood pressures of six patients before and after treatment with a drug. It is believed that the drug will reduce blood pressure. The blood pressures are as follows:

Patient	After Drug	Before Drug	Difference
1	168	171	-3
2	171	170	1
3	182	180	2
4	167	173	-6
5	174	178	-4
6	170	172	-2

The mean difference is -2 with a standard deviation of 3.033

The conclusion at the 5% significance level is

Select one:

a.Reject the null hypothesis. There is insufficient evidence to say that the drug reduced the blood pressure.

b.Fail to reject the null hypothesis. Evidence shows that the drug reduced the blood pressure.

c.Fail to reject the null hypothesis. There is insufficient evidence to say that the drug reduced the blood pressure.

d.Reject the null hypothesis. Evidence shows that the drug reduced the blood pressure.