Name: [tex]$\quad$[/tex] Date: [tex]$\quad$[/tex] Period: [tex]$\quad$[/tex]

Use the following experiment to answer questions 7-10:

If one were to measure the influence of different quantities of fertilizer on plant growth, the experiment would consist of four pots with the same type of potting soil and the same type of plant. Each plant was placed in a well-lit room and watered equally every day.

\begin{tabular}{|l|l|l|l|l|l|l|l|}
\hline
\begin{tabular}{c}
Amount of \\
Fertilizer
\end{tabular} &
Type of Soil &
\begin{tabular}{c}
Day 1 \\
Growth [tex]$(cm)$[/tex]
\end{tabular} &
\begin{tabular}{c}
Day 2 \\
Growth [tex]$(cm)$[/tex]
\end{tabular} &
\begin{tabular}{c}
Day 3 \\
Growth [tex]$(cm)$[/tex]
\end{tabular} &
\begin{tabular}{c}
Day 4 \\
Growth [tex]$(cm)$[/tex]
\end{tabular} &
\begin{tabular}{c}
Day 5 \\
Growth [tex]$(cm)$[/tex]
\end{tabular} &
\begin{tabular}{c}
Total \\
Growth
\end{tabular} \\
\hline
1 tsp & Potting Soil & 1 & 1 & 1 & 2 & 2 & 7 \\
\hline
2 tsp & Potting Soil & 1 & 2 & 2 & 3 & 2 & 10 \\
\hline
3 tsp & Potting Soil & 1 & 2 & 3 & 3 & 4 & 13 \\
\hline
4 tsp & Potting Soil & 2 & 2 & 3 & 4 & 4 & 15 \\
\hline
0 tsp (no fertilizer) & Potting Soil & 0 & 1 & 1 & 1 & 1 & 4 \\
\hline
\end{tabular}

11. What is the independent variable of the above experiment?