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Scatterplots and Correlation

Scatterplots and Correlation Diana Mindrila, Phoebe Balentyne, Based on Chapter 4 of The Basic Practice of Statistics (6th ed.) Concepts: Displaying Relationships: Scatterplots Interpreting Scatterplots Adding Categorical Variables to Scatterplots Measuring Linear Association: Correlation Facts About Correlation Objectives: Construct and interpret Scatterplots . Add categorical variables to Scatterplots . Calculate and interpret Correlation . Describe facts about Correlation . References: Moore, D.

1) The order of variables in a correlation is not important. 2) Correlations provide evidence of association, not causation. 3) r has no units and does not change when the units of measure of x, y, or both are changed. 4) Positive r values indicate positive association between the variables, and negative r values indicate negative associations.

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