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Create scatterplots and calculate the correlation coefficient r to describe linear relationships.
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A scatterplot displays the relationship between two quantitative variables. Each point represents one individual.
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Avoid these 3 frequent errors
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The correlation measures the strength and direction of a linear relationship.
| | Strength | |-------|----------| | 0.8 โ 1.0 | Strong | | 0.5 โ 0.8 | Moderate | | 0.0 โ 0.5 | Weak |
An influential point substantially changes the regression line or correlation when removed.
AP Tip: Always plot the data before calculating . The correlation coefficient can be misleading without seeing the actual pattern (recall Anscombe's quartet).