# A researcher is testing the null hypothesis that Î¼ = 120, with Ï M = 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

A researcher is testing the null hypothesis that Î¼ = 120, with Ïƒ

_{M}= 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?

**Transcribed Image Text:**

## (A) Z -3 BP 118 -2 -1 120 122 124 126 128 130 (B) z -3 3 -2 -1 125 BP 121 123 127 129 131 133 (C) Z -3 BP 124 -2 -1 126 128 130 132 134 136

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**6**Section: Exercises

Problem: 110

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