A patient is injected with the drug and the concentration (units/cc) in the patient's blood is measured every hour for seven hours. Re-expressing these data result in the
Following model and residual plot. What is true about the predicted concentration
Level after 10 hours has elapsed?
Log(Concentration) = 1.79 - 0.169 Time Elapsed.
S = 0.00565191 R-Sq = 100.0%
A) The predicted value is 1.259 units/cc.
B) This value is considered an extrapolation.
C) This value is accurate because R2 = 100%.
D) Both A and B.
E) All of the above.

Question

Quizplus · Accepted Answer

Option A is true as we can plug in the value of time elapsed as 10 in our model equation to get the predicted concentration level.
Option B is also true as we are predicting the concentration level beyond the range of our data. 
Option C is not a valid statement, as R-squared value only indicates the goodness of fit and not the accuracy of predicted values.
Therefore, the best choice is D, as both options A and B are correct.

A Patient Is Injected with the Drug and the Concentration