A study was doneto test whether a new medication increases cognitive performance. Seven volunteers were tested both before and after taking the medication. To test cognitive performance, they played a difficult game requiring mental focus (high scores indicate better performance). Please use the appropriate t-test and do the calculations needed to fill in the blanks below. Please report values with no decimal placeif it comes out a whole number, 1 decimal if it comes out that way, and round to two decimal places when it needs to be rounded.

Before After Med D D²

16 19 3 9

13 16 3 9

15 14 -1 1

17 17 0 0

20 24 4 16

26 28 2 4

25 28 3 9

D=14 D²= 48

For this study, the sample size df = and the mean difference M_D = .

The SS_D = , the variance s²_D = , the standard error S_MD = and your t value = .

Use the t- table to find the correct critical t-value for this hypothesis test (use .05)? report 3 decimal places like the table

Is the difference found between groups in this study statistically significant? Your answer should be simply one word: yes or no