BUAL 2650 EXAM 3 AUBURN UNI QUESTIONS WITH CORRECT ANSWERS

A case with both high leverage and large Studentized residual


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is likely to change the regression model substantially all by itself.




Adjusted R2


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permits a more equitable comparison between models of different sizes.


You can use it to help you decide whether to accept a new model or not.

,indicator variables


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Each location has a different intercept, but they all have the same slope




interactions


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have different slopes and different intercepts




equal variance assumption


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the variability of y should be about the same for all values of x




regression equation


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intercept coefficient + independent variable coefficient(x)

, Larger SSR means


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our model accounts for a large portion of the variability in y




When the data can be divided into two groups with similar regression slopes


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we can incorporate the group information into a single regression model.




quadratic terms


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The scatterplot of the relationship between the two variables is not linear.

There is a curve.If we look at the

Residual plot, we see it doesn't look random, and there isa pattern to the
residuals.




how to tell if it has a large residual


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