Re-expressing these data results in the following model The residuals plotted against the fitted values for this model is shown below. What is true about the predicted concentration level after 10 hours has elapsed?
A) The predicted value is 0.1000 units/cc.
B) This value is considered as a regular one.
C) This value is accurate because R2 = 100.0%.
D) The predicted value is 1.2589 units/cc, and this value is considered an extrapolation.
E) 10 hours falls into the range of the predictor variable Time Elapsed.

Question

Re-expressing these data results in the following model  The residuals plotted against the fitted values for this model is shown below.  What is true about the predicted concentration level after 10 hours has elapsed?
A) The predicted value is 0.1000 units/cc. 
B) This value is considered as a regular one. 
C) This value is accurate because R2 = 100.0%. 
D) The predicted value is 1.2589 units/cc, and this value is considered an extrapolation. 
E) 10 hours falls into the range of the predictor variable Time Elapsed.

Quizplus · Accepted Answer

The plot shows a curved relationship between the predictor and the response variable, which indicates a non-linear relationship. Therefore, a linear model may not be appropriate for prediction outside the range of the data. As such, the predicted value of 1.2589 units/cc after 10 hours is considered an extrapolation. The R2 value does not necessarily indicate the accuracy of the prediction, as it measures the goodness of fit within the range of the data.

Re-Expressing These Data Results in the Following Model the Residuals