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

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.

(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


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

(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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