The researcher should use the following way to analyze the effect of fertilizer on plant growth:
Plot the plant height on the y-axis and time in weeks on the x-axis. Each fertilizer concentration should be plotted on a separate line.
Step-by-step explanation:
A graph is a diagram which is used to represent the relation between variable quantities.
Line graphs are commonly used to track changes over short and long periods of time. Line graph provides the result accurately compared to bar graphs, because it can exactly represent the small changes. Line graphs can be used to monitor changes over the same period of time.
To monitor the effect of fertilizer on plant growth, the height of the plant should be plotted on y-axis and time in weeks on the x-axis. The concentration of each fertilizer should be plotted on a separate line.