10. The data below are from an independent measure experiment comparing four different

energy drinks on an attention span test. The higher the scores, the better the individual did.

Using an alpha level of .05, determine whether this data set indicates any significant

differences among the treatments. If there are any differences, use

post hoc

tests to

evaluate which treatments groups are different from another.

Grand Mean =

Mean T

1

=

Mean T

2

=

Mean T

3

=

Mean T

4

=

Total

1

= ___________

Total

2

= ____________

Total

3

= ____________ Total

4

= ____________

SS

1

= _____________

SS

2

= ___________

SS

3

= _____________ SS

4

= _____________

Control

Herbal Tea

Coffee

Red Bull

12

10

14

20

6

14

18

17

10

12

19

16

12

16

9

15

Source

SS

df

MS

F

Between

Within

Total

RUN POST HOC TESTS: Create Bar Graph and Show all calculations for your planned comparisons.

Then describe your results. Which groups were different from each other?