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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?

Solution Preview

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.