32. Exercise 17 of Section 12.2 gave data on x  rainfall volume and yrunoff volume (both in m3). Use the accompanying MINITAB output to decide whether there is a useful linear relationship between rainfall and runoff, and then calculate a con dence interval for the true average change in runoff volume associated with a 1-m3 increase in rainfall volume.

The regression equation is runoff 

1.13  0.827 rainfall Predictor Coef Stdev t-ratio P Constant 1.128 2.368 0.48 0.642 rainfall 0.82697 0.03652 22.64 0.000 s  5.240 R-sq  97.5% R-sq(adj)  97.3%