http://www.ck12.org Chapter 8. Organizing and Displaying Data for Comparison
and find the five-number summary. The five-number summary is shown below for Vitamin X. By pressing the
H
button, you can get to the second box-and-whisker plot (for Vitamin Y) and collect the five-number summary for
this box-and-whisker plot.
Points to Consider
- How is comparing double graphs (i.e., double box-and-whisker plots) useful when doing statistics?
Guided Practice
2 campus bookstores are having a price war on the prices of their first-year math books. James, a first-year math
major, is going into each store to try to find the cheapest books he can find. He looks at 5 randomly chosen first-year
books for first-year math courses in each store to determine where he should buy the 5 textbooks he needs for his
courses this coming year. He collects the following data:
Bookstore A prices($) 95 75 110 100 80
Bookstore B prices($) 120 60 89 84 100Draw a box-and-whisker plot for both sets of data on the same number line. Use the double box-and-whisker plots to
compare the 2 bookstores’ prices, and provide a conclusion for James as to where to buy his books for his first-year
math courses.
Answer:
The box-and-whisker plots are plotted and look like the following: