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10th grade norms 9th grade ability groups ability level ability to write achievement gains ANALYSIS OF COVARIANCE ANALYSIS OF VARIANCE Anova Anova Results attitude scales Ball State University Burris Laboratory School classroom Communication Difficulty Inventory Composition and Literature composition as covariate Composition Inventory Compositions 1-5 Coop criterion measures df Mean Square Educational Testing Service experimental classes experimental group favorable attitude grammar Group and Lower hear ideas individual intelligence quotients investigators Language Aptitude learning Literature Inventory mean gains mean scores Middle Group MLAT ninth grade students noun null hypothesis OAV procedures paper patterns pretest problems punctuation raters ratio Between Groups ratios Tables Second Experimental Phase Sentences Section sound speech Square f ratio Squares df Mean standardized tests STEP Listening Test STEP Reading students taught Sum of Squares Sum-Squares tape recorder three ability tion Total transitive verb unit Upper Group verb Words in Sentences written composition