Other Regression Models A manager at a gas station realized that there appeared to be a quadratic relationship between the price he charged for a doughnut and the number he sold for the day What is the coefficient of determination 2 for the following data set using a quadratic model Price charged for a Doughnut at QT Number Sold that day FS 0 026 0 160 0 929 0 20 0 50 23 0 75 28 0 99 21 1 10 18 1 50