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9 Prop accuracy acre arithmetic mean average of relative Bureau of Labor calculations chart City and job coefficient of correlation commodity Compute Construct Continued Squares correlation ratio cost per bushel County dependent variable Dun's employed error of estimate figures fitting formula frequency distribution given graph graphic index numbers investigation June Labor Statistics least squares line of trend logarithms Long Tons Manual mean deviation measure of skewness monthly Natural Numbers Nonunion normal curve Number of bricks Number of Wholesale Pearson's Tables Pig Iron Plot Portland Cement probable error problem quartile questionnaire record regression relation relative error relative prices Roots and Reciprocals seasonal variation secured Sheppard's corrections Square Roots standard deviation standard error STATISTICAL MEASURE Statistical Methods summary symbol tabulation Text tion Total or Average U. S. Bureau Union United weighted wheat Wholesale Prices