A model fit predicting preference for President in the US (Democrat, Republican, Independent) using x = annual

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A model fit predicting preference for President in the US (Democrat, Republican, Independent) using x = annual income (in $10,000 dollars) is log(ˆπD/πˆI )=3.3 −

0.2x and log(ˆπR/πˆI )=1.0+0.3x.

a. State the prediction equation for log(ˆπR/πˆD). Interpret its slope.

b. Find the range of x for which πˆR > πˆD.

c. State the prediction equation for πˆI .

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