Question

Want to know if increasing levels of movie violence increases viewer aggression. Three groups of subjects are randomly selected and assigned to groups. All groups view a 30-minute motion picture, but in each version of the movie there are a different number of violent scenes. Following the movie, all subjects are given the TAT (Thematic Apperception Test) and scored on the amount of fantasy aggression displayed, high scores indicating higher levels of aggression.

        No Violent Scenes                            5 Violent Scenes                     10 Violent Scenes

2	3	8
4	4	5
3	2	9
5	1	12
0	1	5
3	3	6
4	4	4
6	4	9
2	0	7
2	1	9
1	0	8
1	2	4
3	4	7
0	2	8
5	1	5
2	5	6
4	4	13
2	3	5

• What is your computed answer? F= *HOW do I put this data into *VASSARSTATS -ANOVA (unspecified)? Steps please..
• What probability level did you use and why?

Answer 1

Using Excel

data -> data analysis -> Anova Single Factor

Anova: Single Factor
SUMMARY
Groups	Count	Sum	Average	Variance
No	18	49	2.722222	2.918301
5	18	44	2.444444	2.379085
10	18	130	7.222222	6.535948
ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	258.9259	2	129.463	32.8216	6.89E-10	3.178799
Within Groups	201.1667	51	3.944444
Total	460.0926	53

F = 32.8216

you can take alpha = 0.05

p-value = 0.0000 < alpha

hence you reject the null hypothesis

we conclude that there is difference in mean