Mya has just surveyed 100 students to get their reaction to a new textbook she is reviewing. She has one data series that she wants to represent graphically, and she needs to display her data in a way that lets her visually compate the data values and see how much contributes to the whole. Sometimes Mya might want to see information on only specific slices. Rather than creating a new chart that includes only those selections, she can an existing chart.