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Pooled vs Unpooled Variance

Distinguish between unpooled variance and pooled variance. What are the assumptions of each? How do you determine which is appropriate?

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Many times, data are collected for a dependent variable, over a range of values for
the independent variable. For example, the observation of fuel consumption might be
studied as a function of engine speed ...

Solution Summary

The solution compares pooled and unpooled variances.