Extraneous Variables For each of the following research questions you must identify some possible extraneous variables, that is things other than the IV that may effect the DV in an unwanted way 1. Does smoking marijuana effect driving performance? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 2. Does eating fish make a person smarter? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 3. Does regular exercise helps weight loss? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 4. Do expensive clothes and an expensive car make a person more attractive as a potential partner? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 5. Does using nicotine patches make a smoker more successful at quitting? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 6. Do drivers who have more experience behind the wheel have fewer accidents than less experienced drivers? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 7. Do people who go to the doctor recover more quickly or completely than those who don’t see a doctor? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 8. Amazingly, those who merely make an appointment to see a doctor start to recover before they actually receive treatment. IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 9. When the teacher is wandering around the room while students are completing the test, students perform better than if a substitute teacher is taking the lesson. IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 10. Do low paid employees have more sick days than highly paid employees? IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 11. Participants who complete the study in the morning get 10% higher marks than those who complete the study in the evening. IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 12. Participants who are told the hypothesis tend to conform to it much more than those who are not told the hypothesis. IV: _______________________________________________________________________________ DV: _______________________________________________________________________________ EV = ______________________________________________________________________________ How could this be controlled? _______________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________
