Final answer:
The most suitable sample to estimate support for high school football field improvements among registered voters would be drawn from attendees at a (1) football game due to its diverse representation and relevance to the issue.
Step-by-step explanation:
The sample that would best estimate the proportion of all registered voters supporting improvements to the high school football field would be drawn from 1) football game attendees. Football games likely attract a diverse representation of registered voters, encompassing various demographics and opinions about high school activities. It offers a broad cross-section of the community's sentiments toward such improvements.
While other locations might capture registered voters, a football game setting aligns closely with the interest in high school-related enhancements, providing a more relevant and representative sample for gauging opinions on this specific issue.