In 1965, data on the connection between radioactive waste exposure and cancer mortality was published. The data was collected from 9 counties that were located near an Atomic Energy Commission facility in Hanford, Washington. The data give the index of exposure and the cancer mortality rate during 1959-1964 for the nine counties affected. Higher index of exposure values represent higher levels of contamination.

Variable Description:

County :Name of county Exposure: Index of exposure

Mortality: Cancer mortality per 100,000 man-years∗ The data is as follows:

County Exposure Umatilla 2.49 Morrow 2.57

Gilliam 3.41 Sherman 1.25 W asco 1.62 HoodRiver 3.83

Portland 11.64 Columbia 6.41 Clatsop 8.34

Mortality 147.1 130.1 129.9

113.5

137.5 162.3 207.5 177.9 210.3

The regression output is at follows: Coefficients:

Estimate Std. Error

(Intercept) 114.716 8.046 Exposure 9.231 1.419

a) Predict the mortality rate fo