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achieve higher analysis BA and BM BA groups behavior Bel Aire School boys and girls Boys grouped boys in mixed-sex California Test Bureau child classroom co-educated Cupertino designed differences in reading differential EQUALLY DIVIDED LOW experimental factors girls grouped Girls Mixed GM groupings grade Groupings at Equally groupings at specified Hartup high I.Q. levels higher than boys hypotheses I.Q. and reading interaction Keys to Reading knowledge of performance knowledge of results learning to read low I.Q. level mean I.Q. Mean Reading Achievement measure middle and high middle I.Q. level patterns Phonetic Keys phonetically-based reading program picture Portal School programmed instruction programmed reading instruction pupil Rdng reading achievement scores reading method reading will achieve reinforcement contingency relationship sample scores for BA sex differences skills social reinforcement sound-symbol associations sounds specified low Stanford Achievement Test Sullivan Programmed Reading treatment group variables vocabulary Wilson School