An investigation of environmental causes of disease collected data on the annual mortality rate?(deaths per?100,000) for males in 20 large towns in a region.?Also, the water hardness was recorded as the calcium concentration?(parts per million or?ppm) in the drinking water. The scatterplot and the regression analysis of the relationship between mortality and calcium?concentration, where the dependent variable is?Mortality, are shown below. Complete parts a through d.

More Info X Variable Coeff SE(Coeff) Intercept 1692 65 27.79 Calcium - 2.87 0.59 R squared - 56.5% s = 81.96 with 20 - 2 = 18 degrees of freedom 2000- 18004 Mortaldy (deaths/ 109:009: 16004