127 101 categorie item 116 index square APPENDIX table student validated research difficult development control appendix homogeneity key plan post 147 149 lesson pre normality moment chi 135 113 clas answer cognitive data 131 after instrument indicator 148 106 121 testing 141 146 validity average 119 documentation 110 value syllabu aspect product normalized LIST level experimental different test 100 distribution 126 reliability page xii 104 143 133 gain hypothesi