Question: The National Survey on Student Engagement (NSSE) has surveyed more than 400,000 students-freshmen and seniors-at 730 U.S. schools since 1999. 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.) Explain why a bar graph would be more suitable for these data than a pie chart.