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ability grouping ability levels academic achievement achievement indexes achievement test results Analysis for Variance assigned Attitude toward peers attitude toward school behavior blacken the space boys Captain Sardus chronological age classroom Client Centered Therapy concept Cornell Critical Thinking Cornell University Critical Thinking Test degree of homogeneity diff differentiation dimension effects upon pupil eighth grade Equally reliable experimental explorers feel girls grouping of junior grouping policy grouping practice health officer's idea high school pupils homogeneity of mental I. Q. strata individual instruments of observation intelligence quotient interpersonal relationships junior high school landed on Nicoma late registrant level of significance little middle low-ability mean measured ment mental age achieved National Education Association Ohio Social Distance person pupils in grades range reliable or unreliable school 09 scores sections Sector Security-Insecurity Inventory significant differences Social Studies standard deviation stratified subsample Table Tork Total Population variables York