| Correlation coefficient | A decimal number between .00 and +1.00 and –1.00 that indicates the degree to which two quantitative variables are related.
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| Curvilinear relationship | A relationship shown in a scatterplot in which the line that best fits the points is not straight.
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| Effect size | An index used to indicate the magnitude of an obtained result or relationship.
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| Inferential statistics | Data analysis techniques for determining how likely it is that results based on a sample or samples are similar to results that would have been obtained for the entire population.
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| Linear relationship | A relationship in which an increase (or decrease) in one variable is associated with a corresponding increase (or decrease) in another variable.
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| Quantitative data | Data that differ in amount or degree, long a continuum from less to more.
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| Scatterplot | The plot of points determined by the cross-tabulation of scores on coordinate axes; used to represent and illustrate the relationship between two quantitative variables.
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