medium · GMAT Quant
A quality control analyst measures the variance in fill volume across two independent assembly lines operating at the same target mean. Line A processed a sample of 11 containers with a sample variance of 12 mL^2, while Line B processed a sample of 21 containers with a sample variance of 18 mL^2. Using the sample variance definition s^2 = dfrac1n-1 sum (x - barx)^2
What is the pooled sample variance s_p^2 of the two lines?
- 15.0
- 16.0
- 17.0
- 15.5
- 20.0
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