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  Module 2
  Module 3
  Module 4
  Module 5

Investigation 1-1
Why Are These Students Getting Sick?


Selected students, with certain characteristics in common, are given "DZ" signs representing a fictitious disease.  Then students observe how the "DZ" is distributed and develop hypotheses about what might have caused that "DZ" distribution.

Investigation Preparation Checklist

Check alignment with standards.

National or State file

Review Epidemiology Background for Module 1.

Word or PDF file

Review teacher's notes and slides:  [en espaņol:]

  • Not animated.  Recommended for quick viewing.
  • PDF: 601KB

  • Not animated.  Recommended for printing.
  • Word: 2,012KB

  • Animated viewing with Microsoft Internet Explorer.
  • HTML Web file: 1,860KB

  • Animated viewing with Netscape or other browser.
  • PowerPoint file: 1,218KB

    Copy Epi Talk handout for each student.

    Word or PDF file

    Copy "DZ" (disease) sign for each student.

    Word or PDF file

    Decide "DZ" sign distributions.

    Word or PDF file

    Copy Investigation 1-1: Epi Log Worksheet for each student.  [en espaņol:]

    Word or PDF file

    Estimated Time / Time Management

    Approximately one class period. Time can be managed by increasing or decreasing the number of "DZ" distributions.

    Look For Students To:

    Describe "DZ" distribution accurately.

    Formulate logical hypotheses.

    Appreciate the uncertainty of hypotheses.

    Consider hypotheses that differ from their own.