1. If the regression line y ^ = 3 + 2x has been fitted to the data points (4, 8), (2, 5), and (1, 6), the residual sum of squares will be:
2. Suppose we estimate a regression of the gallons of paint sold on the price of each gallon and find the following estimated regression line:
y = 268.7 - 18.217x.
Predict how many gallons would be sold if the price is $7 per gallon?
3. Given the regression equation:
y=100 + 21X, an increase in X of 5 units will yield an expected increase in y of units.
Please give the process