Question: Calculate a mean for each group and a grand mean for these data from Exercise 12.20. Group 1: 11, 17, 22, 15 Group 2: 21,

Calculate a mean for each group and a grand mean for these data from Exercise 12.20.

Group 1: 11, 17, 22, 15 Group 2: 21, 15, 16 Group 3: 7, 8, 3, 10, 6, 4 Group 4: 13, 6, 17, 27, 20

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