Forced Expiratory Volume (FEV) Is the Volume of Exhaled Air

Multiple Choice

Forced expiratory volume (FEV) is the volume of exhaled air, and it is related to lung size as well as to lung function. FEV is typically lower in persons with impaired lung function due to disease. The residual plots below are from two regressions: the first plot is from regressing height on FEV and the second is from regressing height on log(FEV) . Based on these plots, which statement is correct?

A) The residual plot for height on FEV shows a nonconstant variance.
B) The residual plot for height regressed on FEV shows a nonlinear pattern.
C) The residual plot for the regression of height on log(FEV) shows a linear pattern.
D) All of the answer options are correct.