Chapter 15
New Terms and Concepts
The following terms were introduced in this chapter. You should be able to define or describe
each term and, where appropriate, describe how each term is related to other terms on the list.
positive relationship: A relationship between two variables where increases in one variable tend
to be accompanied by increases in the other variable.
negative relationship: A relationship between two variables where increases in one variable tend
to be accompanied by decreases in the other variable.
perfect relationship: A relationship where the actual data points perfectly fit the specific form
being measured. For a Pearson correlation, the data points fit perfectly on a straight line.
sum of products (of deviations): A measure of the degree of covariability between two variables;
the degree to which they vary together.
Pearson correlation: A measure of the direction and degree of linear relationship between two
variables.
significance of a correlation: A demonstration that a sample correlation so large that it is very
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 Spring '11
 CynthiaIngle
 Psychology, Statistics, Correlation, Pearson productmoment correlation coefficient, Spearman's rank correlation coefficient

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