CHYS 3P15 Study Guide - Final Guide: Linear Regression, Pearson Product-Moment Correlation Coefficient, Null Hypothesis
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Measuring the extent to which two variables are related. Whether higher scores on a variable are associated with higher, lower, or the same score on another. P value (sig. 2-tailed) = reject when less than 0. 05. *if r value is positive (+), the 2 variables are positively related (high stress is positively correlated with perfectionism) *if the p value is more than 0. 05, don"t pay attention to the r value (variables aren"t related) If you get an r value of 1 = values are perfectly related, a perfect positive relationship. If youy get an r value of -1 = values are perfectly related, a perfect negative relationship. +0. 8 = large effect coefficient of determination (r2) by squaring the value of r, you get the proportion of variance in one variable shared by the other. In any correlation, causality between two variables cannot be assumed because there may be other measured/unmeasured variables affecting the results.