Question: A research MD designs a study to examine the relationship between the dose of a drug and the cumulative urine volume (CUMVOL) for a drug

A research MD designs a study to examine the relationship between the dose of a drug and the cumulative urine volume (CUMVOL) for a drug being considered as a diuretic. The selected group of 24 patients yields the following results.

a. Plot the data in a scatterplot. Would a straight line be an appropriate model relating dose to CUMVOL?
b. Fit a regression model relating CUMVOL to dose.
c. Test for lack of fit of the model at the a = .05 level.
d. Estimate the mean value of CUMVOL for a dose level of 15 using a 95% confidence interval.

Dose CUMVOL 7.1 115 84 80 94 12.0 132 14.7 127 15.5 184 14.4 Dose CUMVOL 12.1 15.8 13.8 20.4 22.7 17.0 19.8 15.6 25.3 13.5 24.8 20.9 6 6 13.5 135 13.5 135 135 135 2025 20.25 20.25 20.25 20.25 2025

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