Question

2. There has been much debate about the impact of television violence on aggression in children. In one study (Bandura & Ross, 1963), one group of nursery school students was shown a film of adults punching, hitting (with a hammer), kicking, and throwing a large rubber Bobo doll. Another group was not shown the film. Afterward, both groups were allowed to play with Bobo dolls in a playroom, and the number of violent contacts was measured in each child. Imagine we replicated the study and obtained the following data (scores are the number of violent contacts with the Bobo doll): No Film Film Group Group 2 5 6 4 0 0 5 1 5 3 7 1 6 0 State the null and alternative hypotheses. Was there a meaningful statistical difference between these groups? (Use the .05 level for significance) Explain your results. What do the results say about the relationship between watching violent acts and aggressive behavior?

Answer 1

solution Given that, Film Group No Film G YOUP. O-WO - ON Film Group: Sample size (n.) = 9 Mean (74) = 2 [x = M = 5.444] Standard deviation (5.)=), E (2:27) (2-5.uuu)+...+(6-5.444) JE 9-1 5. = 1.740 - No - Film Groupi- Sample size (ne)- 9 Mean (R2) = 2 . 12: 2.222

Standard deviation 6) = 6.1 E(1-85 (5-7:222)+ ---0-2-222) 9-1 S, 7:2. 728 The hull and are alternative hypothesis HoiH, = Me Hail & M2 Find the test statastic :- = - 2 te 2 si + 2 Jh, ne Vh 5.444 -2.222 (1.740) (2.728) 9 3.222 0.3364+ 0.8268 3.222 1.0785 t = 2,987 Degree of freedom = n, the-2 = 9+q-2 af = 16 2=0.05. The p-value is 0.0087. Hence the p-value >cance level (X). So we reject Ho. * is less than signifi