118 normality moment validity chi experiment teacher 135 145 119 OF 113 107 documentation journal PAS observation test 136 116 144 120 reability distribution 151 index square clas difficulty 112 126 APPENDIX table perception 108 result 142 student syllabu page 150 130 feasibility 102 homogenity power redox 114 data control product reaction discriminating 115 skill assessment instrument guidance 122 132 appendix valid achievement plan normalized LIST 106 sheet 121 117 lattice topic 133 149 gain questionnaire calculation lesson hypothesi 105 had 146 111