Question

Use the following information to answer the next five exercises. A doctor wants to know if a blood pressure medication is effective. Six subjects have their blood pressures recorded. After twelve weeks on the medication, the same six subjects have their blood pressure recorded again. For this test, only systolic pressure is of concern. Test at the $1\%$significance level.

What is the sample mean difference?

Short answer

The sample mean difference is$-1.33$.

Step-by-step solution

Given information 

The table is

State the sample mean difference

Initially, press the STAT and $\to$to locate test static.

Select TESTS twice more.

To enter the stat list editor, press STAT + 1.

Go to the third list and type $L_2-L_1$in the name list, then hit ENTER after each value.

To get the result, hit Enter after entering the data to get,

Thus, the sample mean difference is $-1.33$.