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Learn about correlations using scatterplots to visualize and understand the relationship strength between variables. Discover linear vs. nonlinear relationships and how outliers can impact data analysis.
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Correlations: Relationship, Strength, & Direction • Scatterplots are used to plot correlational data • It displays the extent that two variables are related to one another
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
Linear and Nonlinear Relationships • Linear relationships are best described by a straight line
Nonlinear Relationships • Nonlinear relationships are best described by another type of curve
Outliers • Outliers are scores that are very different from the rest of the data • They can dramatically impact the relationship between two variables