Chapters 14 and 15 Notes

Chapters 14 and 15 Notes - Chapters 14 and 15(Student...

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Chapters 14 and 15 (Student) 1 Describing Relationships: Scatterplots and Correlations To understand one variable, we must often look at how it is related to other variables. • Bivariate Data Consists of the values of two different variables. Three Combinations of Variable Types Both categorical One categorical and one quantitative Both quantitative Scatterplots • Scatterplots show the relationship between two quantitative variables measured on the same individuals. The values of one variable appear on the horizontal (x) axis, and the values of the other variable on the vertical (y) axis. A point represents the data that has been observed for both variables. The scatterplot shows the relationship between the two variables. Interpreting Scatterplots Look for the overall pattern and any striking deviations from that pattern. Describe the overall pattern of the relationship by Form (linear, curve, scattered, etc) Direction (positive or negative) Strength (weak, moderate, or strong) An outlier is an individual value that falls outside the overall pattern of the relationship.
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