Final answer:
The mean proportion (μ^. p) of graduates with student loan debt in a sample of 80 graduates, based on a 69% proportion in the population, is 0.69.
Step-by-step explanation:
The student's question is seeking the mean of the proportion (μ^. p) for a population from a sample of graduates with student loan debt. As stated by The Institute for College Access and Success, 69% of college students graduated with student loan debt. To find the mean of the proportion (μ^ . p) in a sample of 80 graduates, you would use the proportion in the population (69%) as the mean for the sample. Therefore, μ^ . p = 0.69.
For additional questions related to statistics, such as hypothesis testing, population mean, or distribution usage, it is essential to understand the context and have the necessary sample and population data to perform accurate calculations.