In a controlled experiment aimed at determining the effect of fertilizer on plant growth, researchers divided 50 identical potted plants into five groups: one group received no fertilizer (control), and the other four groups received increasing concentrations of fertilizer (5g, 10g, 15g, and 20g). Over four weeks, the total height of plants in each group was measured weekly. At the end of the experiment, the average height (in centimeters) of each group was recorded in the table below:
Fertilizer (g) | Average Height (cm) |
---|---|
0 | 30 |
5 | 35 |
10 | 40 |
15 | 45 |
20 | 42 |
Based on these results, which of the following statements is supported by the data?