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A researcher wants to test if a new public speaking workshop reduces anxiety. They measure the anxiety levels of 50 volunteers before they participate in the workshop. A week after the workshop is completed, the researcher measures their anxiety levels again and finds that the average anxiety level has decreased. The researcher concludes the workshop is effective. What is the most significant flaw in this study's design?
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Ch.1 Introduction to Psychology - Psychology @ OpenStax
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Introduction to Psychology @ OpenStax Course
OpenStax Psychology (2nd ed.) Textbook
Psychology
Analysis in Bloom's Taxonomy
Cognitive Psychology
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Hypothesis
Independent Variable
Dependent Variable
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Basic Two-Group Experimental Design
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A researcher wants to test if a new public speaking workshop reduces anxiety. They measure the anxiety levels of 50 volunteers before they participate in the workshop. A week after the workshop is completed, the researcher measures their anxiety levels again and finds that the average anxiety level has decreased. The researcher concludes the workshop is effective. What is the most significant flaw in this study's design?
Operational Definition
Simple Random Sampling