Data Set 11-6: Walking Is Valuable Exercise -For Data Set 11-6, the Number of Levels of the of the Place

Multiple Choice

Data Set 11-6: Walking is valuable exercise. Does the size of the place you live have any relationship to how much walking you do? The following data (in miles per day) are entirely hypothetical, but represent a reasonable guess. (The place names for this problem are ordered from large to small and are from particular sources-can you identify a source or two?) $$\begin{array} { l c c c } & \text { Gotham } & \text { Middletown } & \text { Grovers Corners } \\ \Sigma \mathrm { X } & 16 & 24 & 32 \\\Sigma \mathrm { X } ^ { 2 } & 70 & 60 & 140 \\N & 4 & 12 & 8\end{array}$$
-For Data Set 11-6, the number of levels of the independent variable is

A) 1
B) 2
C) 3