An investigation of environmental causes of disease collected data on the annual

Question

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 Click the icon to view the scatterplot and regression analysis a) Is there an association between the hardness of the water and the mortality rate? Write the appropriate hypotheses More Info Variable Cff SE(Coeff) Intercept 1672.49 32.88 b) Assuming the assumptions for regression inference are met, what do you conclude at the 99% level of significance? What is the value of the test statistic? The test statistic is3.787 Round to three decimal places as needed.) What is the P-value? Calcium R squared=44.5% s = 92.27 with 20-2 = 18 degrees of freedom -2.84 0.75 200 (Round to four decimal places as needed.) 1800 140 120 30 60 Calcium (ppm) 90

Explanation / Answer

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 Click the icon to view the scatterplot and regression analysis a) Is there an association between the hardness of the water and the mortality rate? Write the appropriate hypotheses More Info Variable Cff SE(Coeff) Intercept 1672.49 32.88 b) Assuming the assumptions for regression inference are met, what do you conclude at the 99% level of significance? What is the value of the test statistic? The test statistic is3.787 Round to three decimal places as needed.) What is the P-value? Calcium R squared=44.5% s = 92.27 with 20-2 = 18 degrees of freedom -2.84 0.75 200 (Round to four decimal places as needed.) 1800 140 120 30 60 Calcium (ppm) 90

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