In a study to add a new feature to a software program, the programmer introduced two categories, men and women, in the survey she conducted. Is the study observational or experimental? If it is an experiment, what is the controlled factor?
Select the correct answer below:
O The study is an experiment. The controlled factor is the feature to be added in the software.
O The study is an experiment. The controlled factor is the category, men or women.
O The study is an observational study.
O The study is an experiment. The controlled factor is the survey.

Concerning the scenario described in the question given, it is observed that the study is observational, because the researcher makes two groups, observes their behaviors, and then makes inferences according to the result of his observations.

Therefore, the study is observational, not experimental - option C is the correct answer choice.