3. A track coach wants to test the effectiveness of a new training program for distance runners. He selects his two fastest runners and, using a coin ip, randomly chooses one to participate in the new program. The other will continue with the standard training regimen. He then picks the next two fastest runners and randomly assigns one to each program. He repeats this process with all his runners, choosing the two fastest remaining each time. He then compares race times within each group of two runners. For the track coach's study described which of the following best describes a conclusion that can be drawn? (a) We can determine whether race times are faster for runners in the new program, but we can't establish cause and effect. (b) We can determine whether the new training program improves race times more than the standard program for any distance runner. (c) We can determine whether the new training program improves race times more than the standard program for distance runners like those in this study. (d) We cannot draw any conclusions, because all the volunteers were already members of this coach's team. (e) We cannot draw any conclusions, because there was no control group