1. In the least-squares equation,Y' = 10 + 20Xthe value of 20 indicates

a. theYintercept.

b. for each unit increase inX,Yincreases by 20.

c. for each unit increase inY,Xincreases by 20.

d. none of the above.

1. The coefficient of determination

a. Is the square of the coefficient of correlation.

b. Cannot be negative.

c. Reports the percent of the variation in the dependent variable explained by the independent variable.

d. All of the above.