The National Survey on Student Engagement (NSSE) has surveyed more than 400,000 students—freshmen and seniors—at 730 U.S. schools since 1999 (“America’s Best Colleges 2004,” 2003). Among the many questions on the NSSE, students were asked how often they “participated in a community-based project as part of a regular course.” For the students at the 19 institutions classified as national universities that made their data publicly available through the U.S. News & World Report Web site, here are the data: never, 56%; sometimes, 31%; often, 9%; very often, 5%. (The percentages add up to 101% because of rounding decisions.) Explain why a bar graph would be more suitable for these data than a pie chart.