PSYC 218 Study Guide - Midterm Guide: Scatter Plot, Joint Probability Distribution, Linear Regression
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Correlation: a measure of the degree of the degree of relationship. Bivariate distribution: a distribution that shows the relation between two variables. Scatter diagram: a graph of a bivariate distribution consisting of dots at the point of intersection of paired scores. Linear relationship: a relationship that can best be represented by a straight line. The techniques of correlation and predication presented in this text are appropriate only where the underlying relationship between two variable is linear. Curvilinear: the points on a scatter diagram cluster about a curved line). Coefficient of correlation( r ): a mathematical expression of the degree of linear association between two variables. Value of r: range: -1 to 1 to +1. The sign (+, -) indicates only the direction of the correlation. Tow correlation coefficients having the same absolute value but differing in sign indicate the same degree of relationship. The degree of linear relationship = the absolute value of r.
