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15 per cent Absurdities accidental errors according to tests actual Alphabet alternative categories Analogies array centroid chart classes of intelligence coefficient of correlation computed constant errors Constant Increment continuous variable correlation criterion distribution divided esti estimated abilities estimations of ability frequency freshman class freshmen Gaussian distribution give given by alternative grades group of tests group test Hard Directions included indicate instructors judgments lation letter Logical Memory Auditory Logical Memory tests Logical Memory Visual mean mean square error mental tests merit method number of individuals numerical value objection obtained order of merit Pearson scale points of division poor group possible probability curve probable errors product-moment coefficient rank-tangential coefficient regression relation root mean square scoring formula securing estimations seems selected group Sentences Built series of tests Slow standard deviations standing in tests terion test is given test series test standings tion total group value of mental variable given variate viduals