The following MINITAB output presents a power calculation. Alpha = 0.05 Assumed standard deviation = 142.6 Number of Levels = 4 Sample Size Actual Target Power Maximum Means Power Difference 20000 14 0.85 0.864138 200 The sample size is for each level. a. What is the power requested by the experimenter? b. To guarantee a power of 0.864138, how many observations must be taken for all treatments combined? What is the difference between treatment means that can be detected with a power of at least 0.864138? Is the power to detect a maximum difference of 250 greater than 0.864138 or less than 0.864138? Explain. C. d.

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