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Unformatted text preview: with high values of the other variable. Negative association: High values of one variable tend to occur together with low values of the other variable. 2 No relationship: X and Y vary independently. Knowing X tells you nothing about Y . Strength of the association The strength of the relationship between the two variables can be seen by how much variation, or scatter, there is around the main form. With a strong relationship, you can get a pretty good estimate of y if you know x. With a weak relationship, for any x you might get a wide range of y values. 3 Figure 2.1 Mean State SAT Score Versus Percent Taking SAT Describe overall pattern: 2 clusters: 1) high % take low scores (SAT states broad group takes) 2) low % take high scores (ACT states select group takes) Describe pattern within cluster: ACT states roughly linear negative relationship SAT weak linear relationship 4...
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 Fall '08
 ABDUS,S.

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