Question: Suppose that you are conducting an experiment to determine the optimal best amount of fertilizer on tomato plants. You apply 0, 5, 10, 15, or 20 grams of fertilizer per plant. You have 10 plants for each amount of fertilizer, for a total of 50 plants. You keep the following the same during the experiment- type of tomato plant, amount and type of water, amount and type of soil, amount and type of light, type of fertilizer, size of container, and temperature. You take data at the end of the experement and the weight of tomato fruit.
1. What is the independent variable?
2. What is the dependent variable?
3. What is your control group(s)?