The height (in feet) and volume of usable lumber (in cubic feet) of 32 cherry trees are measured by a researcher. The goal is to determine if volume of usable lumber can be estimated from the height of a tree. The results are plotted below.
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(a) In this study, the response variable is

A. height or volume. It doesn't matter which is considered the response.
B. neither height nor volume. The measuring instrument used to measure height is the response variable.
C. volume.
D. height.

(b) The scatterplot suggests

A. there is an outlier in the plot.
B. there is a positive association between height and volume.
C. both A and B.
D. neither A nor B.