Factorial Designs - Main Effects and Interactions - Hatala Experimental Psychology

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What is a "factorial design" and how can it be used for an experiment? Also, what is a "main effect" and how it it different from an "interaction?" Finally, how can you use scatterplots to determine whether a study has significant main effects and interactions?
Recorded in response to Truman State University's COVID-19 move to put courses online, the production values on this video are not stellar, and feature Dr. Mark Hatala, Professor of Psychology, lecturing from his conference room. Please pardon the squeaking of the whiteboard.
  1. Hatala Testing
  2. main effect
  3. interaction
  4. experimental design
  5. marshmallow test
  6. bystander intervention
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Never thought I'd be taught psychology by Woody Harrelson!! Fantastic

jackwilliams-itby