Refer to the previous exercise.
a. At which income level is the estimated probability of voting for the Republican candidate equal to 0.50?
b. Over what region of income values is the estimated probability of voting for the Republican candidate (i) greater than 0.50 and (ii) less than 0.50?
c. At the income level for which pn = 0.50, give a linear approximation for the change in the probability for each $1000 increase in income.