A researcher is interested in seeing if there is a relationship between the use of a particular software program and of the user. The researcher conducts a survey of adults in which she categorizes the respondents into one of two categories, either 18 - 35years old, or 35 years and older. Is the study described observational or experimental? If it is an experiment, what is the controlled factor? Select the correct answer below: The study is an experiment. The controlled factor is age of the respondent. The study is an experiment. The controlled factor is the software program. The study is an observational study. The study is an experiment. The controlled factor is the survey.