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13 Inclusive 13-year-old children 6-Month White Schools 9-month school term ability to add Age Distribution Age Scores Total age-groups ages 11 ages 12 Arithmetic Series Arkansas City cent centile 25 centile Q P. E. chil children in grades children of different city schools country schools County 6-month schools Courtis Series Courtis Standard Research difference in performance different ages dren eighth grade gain in ability gives the facts Hamilton Township Hibbing Louisiana Louisville Madison County 6-month Madison County schools measure of school median ability Median obtained 75 Median obtained median Nassau County obtained median 75 P. E. true Paterson period from ages pupils Q P.E. median ranking in order reported rural schools Salina Santa Clara County school efficiency schools of Madison Scores Total XI Series B Arithmetic Standard Research Tests systems studied teachers Tests in Arithmetic three-year period total gain Total XI X2 Trabue Language Scale XI X2 X3