A health insurance company recorded the annual mortality rate (deaths per 100,00

Question

A health insurance company recorded the annual mortality rate (deaths per 100,000) for residents in 25 towns in a certain region. They also collected data on the water hardness, measured by the calcium concentration (parts per million, ppm) in the drinking water. The following regression output was obtained: Variable Intercept Calcium (ppm) Coefficient 1,694 2.255 Standard error 636.842 1.534 30 60 901 Calcium (ppm) (a) Which hypotheses should be used to test if there is a linear relationship between mortality rate and water hardness? Ho: b1 0 vs. Ha: b10 Ho: ?1-0 vs. Ha : ?1

Explanation / Answer

c) p value for give test statiic and (n-2=23) degree of freedom =0.1551

e)

for 95% CI ; crtiical t =2.069

hence 95% confidence interval =-2.255-/+2.069*1.534=-5.4288 ; 0.9188

( please try -5.4284 ; 0.9184 or -5.4283 ; 0.9183 if above comes wrong)

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