Researchers collected data on the annual mortality rate (deaths per 100,000) for males in 20 large towns and the water hardness in terms of the calcium concentration (parts per million, ppm) in the drinking water. 1925- O O A. There is a fairly strong, negative, linear relationship between calcium concentration and mortality rate. Towns with harder water tended to have lower mortality rates. Mortality O B. There is a fairly weak, positive relationship between calcium concentration and mortality rate. Towns with harder water tended to have lower mortality rates O C. There is a fairly strong, negative, linear relationship between calcium concentration and mortality rate. Towns with softer water tended to have lower mortality rates. 1596- 69 248 Calcium (ppm) b) Here is the regression analysis of mortality and calcium concentration. What is the regression equation? Dependent variable is: Mortality R-Squared = 57.3% S = 60.209 Variable Coefficient SE (Coeff) t-ratio P-value Intercept 1956.639 45.64 42.87