15.6 The paper referenced in the previous exercise also gave data for 12- to 13-year-old girls. Data consistent with summary values in the paper are shown below.

Do the data provide convincing evidence that the mean rating associated with the game description for 12- to 13-year-old girls is not the same for all four age restrictive rating labels? Test the appropriate hypotheses using a 5 .05.

71 label 121 label 161 label 181 label 4 4 6 8 7 5 4 6 6 4 8 6 5 6 6 5 3 3 10 7 6 5 8 4 4 3 6 10 5 8 6 6 10 5 8 8 5 9 5 7