Histogram Analysis and Creation
A Picture is Worth a Thousand Words

Print this page and use it to complete the lesson.

Histograms -- Analysis of Data:
1. Go to http://www.shodor.org/interactivate/lessons/sm3.html
(http://www.shodor.org/interactivate/lessons/sm3.html)
2. On the EXCITE overview page click on the following links in the order listed:
  • "Medical Mystery Tours"
  • "CDC Case Study"
  • "Legionnaires Slide Set"
  • "Age Distribution of Cases"
3. You will see a histogram showing the incidence of Legionnaires Disease by age.
4. Analyze the histogram and answer these questions:
  • Which age group had the most cases of the disease in the decade 1980 - 1989?
  • How many cases are shown in the histogram for ages 50 - 54?
  • Estimate the true rate of cases shown in the histogram for ages 50 - 54.
  • What is the width of each histogram interval?
  • What are nosocomial cases?
  • What are some possible reasons for the high rate of infection of people ages 55 - 80?

Histograms -- Creation:
1. Go to http://www.rpi.edu/dept/union/raf/public/NTSB_Accident_abstracts
(http://www.rpi.edu/dept/union/raf/public/NTSB_Accident_abstracts)
2. Create a histogram showing the number of airplane crashes per year from 1972 - 1989.
3. Create a second histogram showing the number of airplane crashes per airline.
4. Which year was the worst for flyers with respect to crashes?
5. Which airline had the worst record for crashes? The best?
6. Discuss any trends you notice. What are some possible reasons for these trends?

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