STAT 301 Lecture Notes - Standard Deviation, Negative Number, Dependent And Independent Variables
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Obtain a numeric assessment of the relationship by calculating pearson"s correlation coefficient, 11 november r r = n ( x1 x i=1 n z xi i=1. Sx is the standard deviation of the x variable. Sy is the standard deviation of the y variable. Properties of r r does not depend on the units of measurement of either x or y r does not depend on which of the variables is labeled x and which is labeled y. A positive number suggests a positive relationship and a negative number suggest a negative relationship. The closer |r| is to 1, the stronger the relationship. 5 |r| < . 8 moderate linear relationship. 8 |r| < 1 stronger linear relationship. A value of r = 0 does not indicate that there is no relationship between x and y, but that there is no linear relationship.
