Question: A researcher is testing the null hypothesis that = 120, with M = 20. In reality, the population mean is 140. (a) Draw a

A researcher is testing the null hypothesis that µ = 120, with σM =

20. In reality, the population mean is 140.

(a) Draw a figure like Figure 6.12. Designate in the figure the areas representing Type II error and power.

(b) Does one need to worry about Type I error?

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