1. Cereal again. The correlation between a cereal s fiber and potassium contents is r = 0.903. What fraction of the variability in potassium is accounted for by the amount of fiber that servings contain?
2. Another car. The correlation between a car's horsepower and its fuel economy (in mpg) is r = -0.869. What fraction of the variability in fuel economy is accounted for by the horsepower?