3. A scientist planted maize on several plots of land, identical except for pH in the soil. She measured yields in pounds per acre for each plot as summarized in the table. A scatterplot was constructed. Yield vs. PH PH Yield 2800 4.6 1056 2600 4.8 1833 2400 2200- 5.2 1629 2000 5.4 1852 1800 5.6 1783 1600 5.8 2647 1400 6.0 2131 1200 1000- 4 50 4.75 5.00 5.25 5.50 5.75 6.00 PH a. Review the scatterplot of yield (y) versus pH (x). Is the linear model appropriate? b. Compute the least squares line. c. If pH is increased by 0.1, how much would you expect the yield to increase or decrease? d. Compute the yield for a pH of 7.0. e. For what pl would you predict a yield of 1500 pounds per acre