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        9-12

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        Auditory, Visual

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        TrafficJam - Part 5: Make a Model

        Kaelyn and Alex bring the data they collected back to Computer Science Professor Dave, who guides them in building a spreadsheet model to calculate the average amount of time a car currently waits at a red light at their intersection.  Then they determine what traffic signal timings will result in an optimal average delay time.   Along the way, the  students figure out that the time for red vs. green lights needs to be balanced across the different directions.  They also discover that while a short wait time is good, making it too short would not give pedestrians enough time to cross the street. 

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