A new medication for lowering blood pressure is being tested. Sample 1 has systolic blood pressures for the subjects before taking the medication and sample 2 has systolic blood pressures for the subjects after taking the medication. Note that these are the same subjects.

obs #-Sample 1-Sample 2

1-156-154

2-153-143

3-155-146

4-151-139

5-157-146

The following questions have to do with a 2-sided test of significance at = 5% to determine if there is a significant difference between the blood pressures before and after the medication.

What type of test is this?

How many degrees of freedom?

What is the absolute value (positive) of the test statistic in step 4 to 2 decimal places?

Find the p-value to 4 decimal places

Should you reject the null at 5%?

Find the margin of error for a 95% confidence interval on the mean difference to two decimal places.