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Today’s challenge is to do a power calculation in your head. No paper, no pencils, no normal tables, and no statistical software packages are allowed!
Suppose you observe independent draws from each of two normally distributed populations. For simplicity, assume that both populations have a common variance , assumed known. You plan to carry out a test of the ...
In my earlier post on Overlapping Confidence Intervals I asked what we can learn from the overlap, or lack thereof, between confidence intervals for two population means constructed using independent samples. To recap: if the individual confidence int...