Let's start with some questions about percents and percentiles, so we can figure out how much you have learned.

You'll get 50 clams for answering these questions plus a bonus of 25 clams for every question you answer correctly! That's 200 clams if you get them all right, so do your best...

1. 1. Complete this sentence: Half of all parts sell for less than
   clams.
   What is one half as a percent? Drag the slider there.

   OK
2. 2. Select the second graph to view: Copies sold per Design. About        designs sold zero copies.
   • 1,100
     Yes!
     90,000
     Carefully read the caption under the graph
     7,200
     Carefully read the caption under the graph
     0
     Carefully read the caption under the graph
     Carefully read the caption under the graph
   OK
3. 3. Select the Boy Designers filter. What is the 50th percentile point for Boy designers?
   copies.
   Drag the slider until it covers 50% of the data. Make sure your graph view and filter are set properly.

   OK
4. 4. Select the Girl Designers filter. What is the 50th percentile point for Girl designers?
   copies.
   Drag the slider until it covers 50% of the data. Make sure your graph view and filter are set properly.

   OK
5. 5. Which group tends to sell more copies of each part?
   • Both sell the same.
     Compare the 50 percentile price of each group.
     Girl Designers
     Yes!
     Not enough information.
     Compare the 50 percentile price of each group.
     Boy Designers
     Compare the 50 percentile price of each group.
     Compare the 50 percentile price of each group.
   OK
6. 6. There are regular spikes spaced very evenly in the Parts by Price graph. How far apart are the spikes ?
   clams.
   Explore the prices attached to the 8 tallest spikes in the graph.

   OK
7. 7. Why do you think these spikes are spaced like that ?
   • Akbar only allows certain prices in his store.
     There is a better answer!
     Designers like to price their parts at nice even numbers of clams.
     Yes!
     Buyers only like to buy parts that are priced with nice numbers of clams.
     There is a better answer!
     Akbar shows parts with even prices more than other parts.
     There is a better answer!
     There is a better answer!
   OK
8. 8. About        % of all designs sell 300 or more copies.
   %
   See the percentile of parts that sell 299 copies.

   OK
9. 9. Girls buy about
   times as many parts as boys on Whyville.
   Compare the Girl Buyers and Boy Buyers filters

   OK

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