Researchers are interested in if there is a relationship between corn yield and use of pesticide. They randomly assigned a total of 20 plots into two groups: a group where no pesticide is applied, and a group where pesticide is applied.

1. What are the explanatory and response variables?Explain.
2. Is this an experiment or an observational study?Explain.
3. If there is a significant difference between the two groups, can a cause and effect relationship be determined?Explain.