Abstract
This chapter focuses on the correlation coefficient and regression lines. If there is a functional relationship between two quantities, the shape of the curve is determined by corresponding values of the two variables. There is only one curve in the rectangular system of coordinates; if the function is linear, it is a straight line. For correlation, the curves represent average values of one characteristic corresponding to changing values of the other. The chapter presents a formula for calculating the regression line equations and the correlation coefficient using the contigency table for the heights and weights of young men enrolling for university studies in Warsaw in 1946. The chapter presents the numerical results of the investigation.
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