A new medication for lowering blood pressure is being tested. Sample 1 has systolic blood pressures for the control group and sample 2 has systolic blood pressures for the experimental group.

obs # - Sample 1- Sample 2

1-139-121

2-136-129

3-150-142

4-147-141

5-148-134

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 groups.

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 difference in means to two decimal places.