In two equivalent problem situations, 12 children are praised on one occasion and blamed on another. Their reactions toward others subsequent to the problem situations are judged for aggressiveness. Ratings of aggressive behavior are as follows:
Child: A BCDEFGH I JKL
Praise: 6 8 2 1 4 5 6 9 8 7 7 3
Blame: 7 11 4 5 3 7 9 8 9 11 9 6
Examine, by the sign test, the hypothesis of no difference between the two treatments. Use a = .05 and a= .01. a =12.