31. Yоu аre cоnducting аn experiment tо determine the effect of vаrying levels of caffeine on high school swimmers. You will be varying the amounts of caffeine consumed by each swimmer 1 hour before swimming a 200 meter race. You have already recorded times for each swimmer at a normal practice, without the use of caffeine supplements for comparison to your results. Use the information provided to correctly match the variables for this experiment.