Final answer:
The AAP does not directly provide PPE recommendations for high school athletes, but supports the use of proper safety gear in sports. Precautionary preventive exercises like stretching are encouraged to prevent injuries. Questions a and b relate to probabilities and require specific data to answer.
Step-by-step explanation:
The American Academy of Pediatrics (AAP) does not directly provide recommendations regarding Personal Protective Equipment (PPE) specifically for high school athletes in the context of sports and exercise. However, the importance of PPE is emphasized for prevention of injuries and protection during athletic activities. The AAP supports the use of appropriate safety gear in sports, which could include helmets, mouthguards, protective eyewear, and proper padding. Moreover, precautionary preventive exercises are also recommended to reinforce the students’ physical health and to prevent injuries. Stretching before exercise is one such precautionary preventive exercise that is commonly advised.
Regarding the given probabilities, these questions seem to pertain to statistics rather than health recommendations. To answer question a, “What is P(Athlete stretches before exercising)?”, one would need to know the overall probability of an athlete stretching before exercising. For question b, “What is P(Athlete stretches before exercising|no injury in the last year)?”, the requested probability is conditional and requires data on the frequency of stretching among athletes who have not been injured in the last year.