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actual algebra amount arithmetic mean assumed mean average base line cent central tendency class-interval coefficient of correlation coefficient of reliability column Computing the Coefficient contains corre correction correlation table corresponding cumulative frequency desired distance divided equal equation error of measurement example expressed figure formula frequency distribution geometric mean given harmonic mean height illustrated includes Intelligence Quotient interval Kelley latter lower limit McCall mean deviation meas measures of variability median mid-point mid-score mode multiple correlation normal curve normal distribution normal frequency curve number of measures obtained ordinate partial correlation percentile polygon prob probable error pupils quartile deviation range References Rugg regression relationship represents result Rietz scale school marks scores series of measures shows simple series skewness smooth standard and probable standard deviation standard error subtracted tabulated Thorndike tion total number Trabue Twenty-First Yearbook usually width words Yule