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01 level 370 Alberta ninth-grade abcd ability to read age and chronological Alberta ninth-grade pupils Alberta reading test analysis of variance angiosperm answer sheet basis Canada Chicago chronological age coefficients Columbia University content achievement content fields content vocabulary correlation covariance dicotyledons difference Distribution of scores draw inferences Edmonton Educational Research Eva Bond factor groups gymnosperm High School Entrance identify details investigation Journal of Educational level of significance literature achievement mathematics achievement measured ment mental ability mental age monocotyledons ninth null hypothesis problem Pythagoras random sample read literature materials read mathematics materials read science read social studies reading abilities Reading Activities reading comprehension reading skills Rejected sample of 370 School Entrance Examination science achievement science materials social studies achievement social studies materials specific spermatophytes statistical Table Teachers College types of reading University variance and covariance Vegreville