-55 h9: 02<0 05<0 02 04 0 <0 2 1 54 20450<1 h10: There is no significant difference in the pre- and posttest comparison for the variable, differentiation. h : 02<0 10. 2 3 Table VI shows the F and t ratios for the differentiation variable obtained through comparison of experimental and control groups for five inequalities suggested in the design. TABLE VI F AND T RATIOS OF FIVE DESIGN SUBGROUPS ON DIFFERENTIATION SCORE OF OBSERVATION INSTRUMENT Differentiation Subgroups F Ratio d.f. 02<01 0.7376 11 05<04 1.0834 12 02<04 0.7347 12 05<01 0.8132 11 T Ratio d.f. 02<03 0.144 12 * confidence level 0.05 ** confidence level 0.01 No subgroup discriminated significantly between the experimental and control groups on the variable, differentiation.