41. The article Rate of Stuttering Adaptation Under Two Electro-Shock Conditions (Behav. Res. Therapy, 1967: 49—54) gives adaptation scores for three different treatments: (1) no shock, (2) shock following each stuttered word, and (3) shock during each moment of stuttering. These treatments were used on each of 18 stutterers.

a. Summary statistics include

, and

. Construct the ANOVA table and test at level .05 to see whether true average adaptation score depends on the treatment given.

b. Judging from the F ratio for subjects (factor B), do you think that blocking on subjects was effective in this experiment? Explain.