Measuring linear association

Measuring linear association -...

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Measuring linear association: correlation scatterplot  displays the direction, form, and strength of the relationship  between two  quantitative variables . Linear (straight-line) relations are  particularly important because a straight line is a simple pattern that is quite  common. A linear relation is strong if the points lie close to a straight line, and  weak if they are widely scattered about a line. Our eyes are not good judges of  how strong a linear relationship is. The two  scatterplots  in  Figure       4.4      depict  exactly the same data, but the lower plot is drawn smaller in a large field. The  lower plot seems to show a stronger linear relationship. Our eyes can be fooled  by changing the plotting scales or the amount of space around the cloud of points  in a  scatterplot . 5
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This document was uploaded on 11/02/2011 for the course MATH ma 116 at Montgomery.

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Measuring linear association -...

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