An agricultural ecologist wants to investigate the effects of pollution on soybean plants. The scientist grows five groups of plants and exposes four groups to various pollutants. The fifth group is not exposed to any pollutant. The ecologist observes the condition and growth of all the groups of plants over a period of time.
1) What is the control /constant?
2) What is the dependent variable? 3) What is the independent variable?
4) Are the variables qualitative or quantitative? Why
5) Identify possible sources of unavoidable experimental error
