A B C D E

Notes for Session 2, Part A

Note 2

If you're working with a group, you may want to organize a coin activity based on Problem H2 from Session 1 before watching the video segment. Here's how the activity can be organized:

Label the corners of a large square poster board with the letters P (for Philadelphia), D (for Denver), S (for San Francisco), and N (for none). Separate 100 nickels according to mint mark (using magnifying glasses, if needed), and place them on the corner of the poster board corresponding to their mint location. Discuss the following question:

 • Based on what you see, what can you say about the way the coins are distributed among the four different mint marks?

Statisticians find it useful to think in fractional terms, i.e., proportions or percentages. In order to start thinking about the coin data in fractional terms, cross two pieces of string to divide the poster board into four sections (one for each mint location). Adjusting the strings to keep the coins from each of the four mint marks separate, slide the coins to form a circle. This will result in a pie chart. Discuss the following questions:

 1 Based on what you see in the pie chart, what can you say about the way the coins are distributed among the four different mint marks? Specifically, what fraction of the total would you guess is represented by each group? 2 Which location has the most coins? Why do you think this location is the most common? 3 Which location has the least coins? Why do you think this location is the least common?

Watch the video segment, and compare your hypotheses with those of the online participants.