The report titled the american freshmen looks at the national norms of college freshmen by analyzing the responses of 203,967 first-time full-time freshmen entering 270 institutions across the united states. it found that over the past two years, the percentage of students who describe themselves as "liberal" (27.6%), or "conservative" (20.7%) has not changed significantly. the percentage of those identifying as "middle of the road" (47.4%) has risen slightly. what is the population and sample?