Data Collectionmedium
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A researcher examines the relationship between college major and first-year salary using data from 8,000 recent graduates. She estimates two regression models:
Model 1 (Major only): Business majors earn 5,200–$8,400, p < 0.001).
Model 2 (Major + GPA): Business majors earn 800–$4,000, p = 0.004).
Why does the estimated major effect decrease substantially when GPA is included?
A researcher examines the relationship between college major and first-year salary using data from 8,000 recent graduates. She estimates two regression models:
Model 1 (Major only): Business majors earn 5,200–$8,400, p < 0.001).
Model 2 (Major + GPA): Business majors earn 800–$4,000, p = 0.004).
Why does the estimated major effect decrease substantially when GPA is included?