In Competitive Sports, Video Recorders Have Been Used More Frequently

In competitive sports, video recorders have been used more frequently in recent years. The idea behind the recorder is that coaches can replay training sessions for more effective feedback to the athlete. Some people believe video recording may make the athletes more nervous and actually decrease their performance. You have been asked to design an experiment to address this issue for competitive high school tennis players. You have decided to use the accuracy of tennis serves as your response variable, and the number of successful serves out of 100 as your performance measure. The subjects for your experiment are 60 high school male competitive tennis players of varying ability who have volunteered for the experiment.
(a)Describe the treatments in your experiment
(b)One possible confounding variable is the experience levels of the players. Explain how you would control this variable?
(c)Can the results of this experiment be generalized to all male tennis players? Why or why not?