Final answer:
We would be most interested in the population proportion when estimating the proportion of the population that possesses a certain characteristic or exhibits a particular behavior.
Step-by-step explanation:
When dealing with experimental questions, we are typically interested in population parameters. In some cases, we are interested in the population proportion instead of the population mean. A situation where we would be most interested in the population proportion is when we want to estimate the proportion of the population that possesses a certain characteristic or exhibits a particular behavior.
For example, if we want to know what proportion of the population smokes or what proportion of voters support a specific candidate, we would be interested in the population proportion.
Therefore, the experimental question that focuses on the population proportion is:
What proportion of the population has a college-level education?