• tangor, C. (2013). Research methods for the behavioral sciences (4th ed., Laureate Education custom ed.). Belmont, CA: Wadsworth Cengage Learning.
  • Chapter 12, “Experimental Control and Internal Validity”
  • Chapter 13, “External Validity” (pp. 254–263)
• Read the “Thinking Critically About Research” scenarios (a—i) in Chapter 12, pages 256–258.
• Choose the scenario that most interests you. Note: Before selecting a scenario, view the Discussion 4 Forum to see if any colleagues have already posted. If so, select a letter that has not yet been chosen. All nine (a–i) letters should addressed before a student repeats a letter.

For your chosen scenario, determine the possible confounding variable(s) (there may be more than one), and consider how they might be eliminated using research designs presented in the readings (e.g., 2×2 factorial design).

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