medium · GMAT Quant
An educational researcher measures test score variance across two classrooms with identical mean scores. Classroom A has n_A = 6 students with a sample variance of 20, and Classroom B has n_B = 16 students with a sample variance of 50.
What is the pooled sample variance for the combined group of 22 students?
- 42.5
- 35
- 850
- 38.6
- 41.8
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