Which of the following research questions would be best suited to using a 2x2 factorial design?
a. Does using a cell phone while driving affect standard deviation of lateral position (SDLP)?
b. Do older adults find banking easier in person, on the phone, on computer, or using a tablet?
c. Does using cannabis have a larger impact on driving speed or standard deviation of lateral position (SDLP)?
d. How do cannabis and alcohol affect driving performance, separately and together?
Answer: D