2. During the 1950's, radioactive waste leaked from a storage area near Hanford, Washington, into Columbia river nearby. For nine counties downstream in Oregon, an index of exposure (X) was calculated (based on distance from Hanford, and distance of the average citizen from the river, etc.). Also, the cancer mortality (Y) was calculated (deaths per 100,000 person-years, 1959-1964). A summary of the data is given below: =4.6, =160, E(X;-) =97.0, E(YP-) =9400, E(X-)(Y,-)=876. a) Calculate the regression line for predicting Y from X. Estimate cancer mortality at X=3.7. b) Find a 95% confidence interval for P1. Obtain a 95% prediction interval for cancer mortality if X were 3.7