Suppose you are trying to show the effectiveness of a school program in reducing test anxiety (1-50 scale). You record the anxiety levels of 6 students before entering the program and record their anxiety levels after completing the program. XA represents their anxiety levels before and XB represents their anxiety levels after.

They believe that it will reduce anxiety.

Suppose that the distribution is known to be approximately normal.

SAMPLE

ID	XA	XB
A	32	27
B	44	35
C	21	23
D	26	28
E	28	25
F	34	20

What is the observed mean sample change?

What is the best estimate of the standard error of the sampling distribution for the mean change?

What is the best estimate of the standard deviation of the population mean change?

What is the sum of squares?

What is the standard score for the mean sample change?

What can you conclude? (Choose the best answer)