medium · GMAT Quant
An environmental scientist measures air quality index variance across two monitoring stations with identical average readings. Station A collects 14 daily readings (n_1 = 14) with sample variance s_1^2 = 24. Station B collects 27 daily readings (n_2 = 27) with sample variance s_2^2 = 42.
What is the pooled sample variance s_p^2 across both stations?
- 36
- 33
- 34.24
- 1404
- 35.10
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