1. Suppose we were interested in knowing how the amount of fertilizer influences the corn yield. The yield per plot in bushels of corn was observed on 10 plots that had been fertilized in varying degrees. The data are given in the following table: Yield (in bushels) Fertilizer (in pounds) 12 13 13 14 15 DOGUARWWNN 15 14 16 17 18 x; = 40, Ey: = 147, Ex7 = 180, Ey7 = 2 193, Exy =611 (a) The response variable, y , is: (b) The explanatory variable, x, is: (c) Based on the following scatter plot, how would you describe the relationship between x and y? 13 + 2.5 4.0 4.5 5.0 5.5 6.0