A psychology professor uses three different methods of instruction in three small classes, with the assignment of students to classes being random, and gives each class the same final examination. The results are in the table that follows.

(a) Perform the appropriate test to compare each possible pair of groups and, in each case, state which group had the higher scores and whether the results were statistically significant at the .01 as well as the .05 level.

(b) Calculate the appropriate measure of the strength of relationship between method of instruction and examination scores for each pair of groups, and comment briefly on the apparent size of the effect.

Group 1 Group 2||Group 3 60 |86 94 42 97 97 96 |61 100 73 72 57 40 99 93 63 96 90 87 98 92 65 97 67