You Are a Biologist Studying Deer Populations in Four Parks

You are a biologist studying deer populations in four parks: Chagrin, Bedford, Bradley, and Brookside. These four parks are all the same size, and they have similar weather. You estimate deer population size in October 2011, before winter comes. Then you estimate the size of the herd the next year, in October 2012. The data are listed in the table:
$$\begin{array} { | l | c | l | } \hline \text { Park } & \text { October 2011 Population } & \text { October 2012 Population } \\\hline \text { Chagrin } & 125 & 90 \\\hline \text { Bedford } & 50 & 77 \\\hline \text { Bradley } & 150 & 68 \\\hline \text { Brookside } & 75 & 96 \\\hline\end{array}$$
Explain whether each of the following statements is supported by the data and why or why not.
I. These populations have exponential growth.
II. The changes in population size are density dependent.
III. All of these populations are below their carrying capacity.