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Unformatted text preview: 3. Tests for correlation should not based on rates or averages. 4. Do not use the regression equation for predicting if there is no significant correlation. 5. When using the regression equation for predicting, stay within the range of the X variable. 6. A regression equation based on old data is not necessarily valid for current situations. 7. A regression equation based on current data is not necessarily valid for future situations. 8. Do not use the regression equation to make predictions about a population that is different from the population from which the sample data were drawn....
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- Spring '08