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Chapter7

Chapter7 - Chapter 7 Scatterplots Association and...

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Chapter 7 Scatterplots, Association, and Correlation

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Scatterplot A scatterplot shows the relationship between two quantitative variables measured on the same cases.

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Association Relationships between variables are often at the heart of what we’d like to learn from data: Are grades actually higher now than they used to be? Does in increase in smoking increase the rate of a heart attack? Do students learn better with the use of computer technology? Questions such as these relate two quantitative variables and ask whether there is an association between them
3 Things About Association When we look at a scatterplot, we want to know about 3 things: Direction, Form, and Strength. Direction: A scatterplot starting from the lower left to the upper right is said to be positive. A scatterplot starting from the upper left to the lower right is said to be negative.

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Form: We care about the scatterplot being straight, but other patterns should be described. Strength: A scatterplot is said to show a
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Chapter7 - Chapter 7 Scatterplots Association and...

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