Final answer:
The true statement about the correlation between summer employment and teenagers' academic success cannot be determined without the specific textbook. However, studies often find that moderate work hours might positively affect academic success, while excessive work could be detrimental due to decreased time for studies and extracurricular activities.
Step-by-step explanation:
According to the textbook, the correct statement concerning summer employment and teenagers that is true is not explicitly provided here, and we cannot determine the correct answer without access to the specific textbook. However, relevant research often examines the impact of work on teenagers' educational outcomes, including academic performance and extracurricular activities. While studies can show mixed results, it's generally believed that moderate work hours can positively correlate with improved time management and responsibility, which might indirectly benefit academic success. Excessive work hours, however, have the potential to interfere with school-related activities and may negatively affect both academic performance and participation in extracurricular activities.
In a similar vein, TV watching is often studied for its effects on students' grades, and the information provided suggests a negative correlation. As the scenarios describe, excessive TV consumption could be detrimental to academic success, possibly due to the reduction in study time.
In summary, while the direct answer to the question is not found in the provided text excerpts, the broader context of how extracurricular activities, such as employment or TV watching, impact academics is important. For an accurate answer, the textbook should be consulted directly.