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Example 1.11 from Statistics, 1.2 Data, Sampling, and Variation in Data and Sampling
Suppose the guidance counselors at De Anza and Foothill need to make an oral presentation of the student data presented in Figures 1.5 and 1.6. Under what context should they choose to display the pie graph? When might they choose the bar graph? For each graph, explain which features they should point out and the potential display problems that might exist.
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
The guidance counselors should use the pie graph if the desired information is the percentage of each school’s enrollment. They should use the bar graph if knowing the exact numbers of students and the relative sizes of each category at each school are important points to be made. For the pie graph, they should point out which color represents part-time students and which represents full-time students. They should also be sure that the numbers and colors are visible when displayed. For the bar graph, they should point out the scale and the total numbers for each category, and they should be sure that the numbers, colors, and scale marks are all displayed clearly.
How did it go?