IN A LEARNING EXPERIMENT, 10 STUDENT ARE RANDOMLY ASSIGNED TO EACH OF FOUR GROUPS. EACH GROUP IS ASKED TO PERFORM A SET OF TASK AFTER EXPOSURE TO THE EXPERIMENTAL TREATMENT. DO THE GROUPS DIFFER IN TASK PERFORMANCE? AT 5% LEVEL OF SIGNIFICANT.

group 1 group 2 group 3 group 4 20 19 18 16 18 18 18 16 17 18 15 15 17 17 14 15 15 15 13 14 14 14 12 12 12 13 12 12 11 13 11 10 10 10 10 8 10 8 9 un