Correlations: Relationship, Strength, & Direction Scatterplots are used to plot correlational data – It displays the extent that two variables are related.

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Presentation transcript:

Correlations: Relationship, Strength, & Direction Scatterplots are used to plot correlational data – It displays the extent that two variables are related to one another 1

Relationship Strength The strength of a relationship between two variables is on a scale from -1 to 1 – Stronger relationships are closer to -1 or 1 – Weaker relationships are closer to 0 2

Examples of Scatterplots 3

Linear and Nonlinear Relationships Linear relationships are best described by a straight line 4

Nonlinear Relationships Nonlinear relationships are best described by another type of curve 5

Outliers Outliers are scores that are very different from the rest of the data They can dramatically impact the relationship between two variables 6

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