plugin-Chapter 14 Students

plugin-Chapter 14 Students - Describing Relationships...

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CHAPTER 14 Describing Relationships: Scatterplots & Correlation
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RELATIONSHIPS So far, we’ve only examined the distribution of a single variable. We can look at some sort of graphical display or numerical summary. Often times, however, we would like to see how one variable relates to another variable.
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SCATTERPLOTS A scatterplot is the most common way to display the relationship between two ___________ variables measured on the same individual. The values of one variable appear on the x-axis and the values of the other variable appear on the y-axis. If we have an explanatory variable, that goes on the x- axis. The response variable then goes on the y-axis. Each individual in the data appears as the point in the plot fixed by the values of both variables for that individual.
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DESCRIBING SCATTERPLOTS As usual, we want to look for the overall pattern and any striking deviations from that pattern. We describe the overall pattern of a scatterplot by talking about the form, direction, and strength of the relationship. The form of a relationship refers to whether our scatterplot takes a linear pattern or a curved pattern.
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DESCRIBING SCATTERPLOTS The direction of a scatterplot refers to whether we have
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This note was uploaded on 08/05/2011 for the course STA 200 taught by Professor Wierdhobbitguy during the Summer '08 term at Kentucky.

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plugin-Chapter 14 Students - Describing Relationships...

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