Strategies for Educational Inquiry

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Week 4: Sampling & Threats to Internal-External Validity - Feb 1

1. Textbook and other Readings
   • Johnson & Christensen Chapter 7
   • Johnson & Christensen Chapter 8

2. Textbook Lectures
   1. Johnson & Christensen: Sampling Lecture

   2. Johnson & Christensen: Threats to Internal & External Validity

3. Sampling
   1. Overheads for sampling

   2. Brief definition of sampling methods

   3. Become acquainted with random numbers

   4. Overview of sampling

   5. Sampling lecture notes from another research methods course

   6. How to use a random number table

   7. Research Randomizer Site

   8. Sample Size Calculator

   9. Another Sample Size Calculator

4. Threats to Internal & External Validity
   1. Lecture Slides -- Threats to Internal & External Validity

   2. Threats to Internal Validity

   3. Threats to External Validity

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