A researcher is interested in determining whether exercise can curb appetite for adults living with obesity. To address the hypothesis, the researcher randomly assigns the adults to either an exercise group OR a control group (no exercise). The researcher then asks each participant how hungry they are before and after receiving the exercise intervention or control. What are the independent variables? What is the dependent variable?
1) Group (exercise, control) and appetite; Time point (pre, post)
2) Group (exercise, control) and time point (pre, post); Appetite
3) Appetite and time point (pre, post); Group (exercise, control)
4) The researcher's opinion and appetite; Time point (pre, post)