How does sleep deprivation affect your ability to drive? a recent study measured the effects on 19 professional drivers. each driver participated in two experimental sessions: one after normal sleep and one after 27 hours of total sleep deprivation. the treatments were assigned in random order. in each session, performance was measured on a variety of tasks including a driving simulation. use key terms from this module that will be used to describe the design of this experiment. what is the explanatory variable? a. length of driving experience b. amount of sleepc. type of vehicle d. amount of caffeine consumed