7.2 Sample vs. Census Explain the difference between a sample and a census. Every 10 years, the U.S. Census Bureau takes a census. What does that mean? 7.8 Sampling GPAs Suppose you want to estimate the mean GPA of all students at your school. You set up a table in the library asking for volunteers to tell you their GPAs. Do you think you would get a representative sample? Why or why not? 7.22 Unbiased Sample? Suppose you attend a school that offers both traditional courses and online courses. You want to know the average age of all the students. You walk around campus asking those students that you meet how old they are. Would this result in an unbiased sample