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116 teachers 1930 Favorable activities attitude Average class gains bars show booklets cent chapter Chart child children's writings classroom typewriter Control children Control classes Control gains Control groups Control pupils Control teachers copied correlations elementary school Error Index experiment Experimental and Control Experimental children Experimental groups Experimental pupils Experimental teachers Facsimile Favorable Unfavorable Grade 4 Grade Grade Score Grade grade units grades four grades three hand handwriting quality handwriting rate handwritten indicated initial and final intelligence quotient interest judgments kindergarten learning letters machines ment mental and Control number of pieces papers perimental pieces written practice primer type probable errors proportions of teachers quantity of writing quotient group room typewriter Score Grade Score sentences September 1929 show the proportions shown spelling Stanford Achievement Test Stanford tests stories TABLE teachers reported teaching tion Typewriter and Control typewriter helps Typewriter pupils typewritten typing rate upper grades words per pupil