An experimenter tests the hypothesis that physical exercise people's mood (makes them happier). subjects in the experimental group participate on monday and tuesday and those in the control group on wednesday and thursday. in this study, what is the dependent variable?

The answer is "the mood (degree of happiness)".

A dependent variable is the variable being tried and estimated in a logical trial.  

The dependent variable is 'reliant' on the independent variable. As the experimenter changes the independent variable, the impact on the dependent variable is watched and recorded.

Thus in the given situation the mood (degree of happiness) is dependent variable.

answer; knowledge,reason,and judgement;