R5.30. Hard water In an investigation of environmental causes ofdisease, data were collected on the annual mortality rate(deaths per 100,000) for males in 61 large towns in Englandand Wales. In addition, the water hardness was recorded asthe calcium concentration (parts per million, or ppm) in thedrinking water. Here are the scatterplot and regression anal-ysis of the relationship between mortality and calciumconcentration.Dependent variable is MortalityR-squared = 43%s = 143.0 with 61 - 2 = 59 degrees of freedomVariableInterceptCalciumMortality (deaths/100,000)20001800160014001200+Coefficient1676-3.2330SE(Coeff)29.300.489060Calcium (ppm)120a) Is there an association between the hardness of the waterand the mortality rate? Write the appropriate hypothesis.b) Assuming the assumptions for regression inference aremet, what do you conclude?c) Create a 95% confidence interval for the slope of the trueline relating calcium concentration and mortality.d) Interpret your interval in context.

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Answered: R5.30. Hard water In an investigation…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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