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Statistical method in educational measurement / by Arthur S. Otis; Otis, Arthur Sinton, 1886-1963; Yonkers, N.Y., : World book company, 1926, c1925; Includes bibliographical references (p. 321-328) and an index;""Introduction -- The central tendency of a distribution -- Representing the whole of a distribution -- Grouped distributions -- The percentile graph -- The law of normal distribution -- Percentile curves -- Variability of scores -- Percentile rank in a normal distribution -- The correspondence between tests -- Averaging measurements of a pupil -- The growth of mental ability -- The measurement of brightness -- Norms -- The meaning of correlation -- The calculation of a coefficient of correlation -- Correlation and prognosis -- Partial correlation -- Multiple correlation -- Reliability -- Grading and classifying""

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