PSY 2116 Lecture Notes - Lecture 4: Partial Correlation, Research Question, Test Statistic
5 Mar 2016
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Stat relationship between 2 variables, extent to which they are related. Checks if one variable increases what the other does. Correlation = dividing covariance by standard dev x * standard dev y. R observed greater than r critical reject the null. Coefficient of determination: measure of amount of variance in one variable that is shared by the other variable, interpreted as measure of effect size. 1 = small effect, . 3 = medium effect, . 5 = large effect. Look at relationship of 2 variables while effects of another variable are held constant. Non-normal data, ordinal ranked data can still do correlation. Spearman: non-parametric stat on ranked data, useful to minimize effects of extreme scores or violation of assumptions o rs. Step 7 - write up o o o o o o. A correlational analysis was conducted to determine whether there was a. Relationship between comfort with statistics and exam performance.
