Elements of Practical Statistics

actual values arithmetic mean array assumed mean average yield axis Based on data Bushels calculated cent Chart class interval units coefficient of correlation composite index number correction factor correlation ratio cost curve data in Table Department of Agriculture dependent variable DEVIATIONS FROM POINT difference dividing equation estimated or predicted farm formula frequency distribution grades illustrated indicates least squares linear located logarithms magnitude mantissa mean deviation measure median midpoint minus multiple correlation multiples of standard multiplying normal distribution number corresponding number of frequencies number of items number of pairs obtained ordinate pairs of items path coefficient Pearsonian percentage changes point of origin pounds preceding probable error quantity quartile quotient rainfall ratio regression relationship represented sample selected snow cover square root SQUARES OF DEVIATIONS standard deviation statistical straight line trend subtracting tion total number trend of least true mean United States Department Yearbook YIELD PER ACRE