CHAPTER 8: INTERNAL and EXTERNAL VALIDITY
1. History Can be a problem in a repeated measures (within subjects) design where each participant is tested in each group. A history effect is present when an event (external to participants) occurs: a) Between presentations of the levels of the IV e.g. IV = day of the week: between taking a quiz on Tuesday
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CHAPTER 8: INTERNAL and EXTERNAL VALIDITY
rogeriofvieira.cominternal validity) we are making the experiment more and more artificial and thereby it’s generalizability (external validity) suffers. An exception would be in reference to specific control techniques
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