A model fit predicting preference for U.S. President (Democrat, Republican, Independent) using x = annual income (in
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A model fit predicting preference for U.S. President (Democrat, Republican, Independent) using x = annual income (in $10,000) is log(π̂D/π̂1) = 3.3 – 0.2x and log(π̂R/π̂1) = 1.0 + 0.3x.
a. Find the prediction equation for log(π̂R/π̂D) and interpret the slope. For what range of x is π̂R > π̂D?
b. Find the prediction equation for π̂1.
c. Plot π̂D, π̂1, and π̂R for x between 0 and 10, and interpret.
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