Question: Suppose that four normal populations have common variance 2 25 and means 1 50, 2 60, 3 50, and 4

Suppose that four normal populations have common variance 2 25 and means 1 50, 2 60, 3 50, and 4 60.

How many observations should be taken on each population so that the probability of rejecting the hypothesis of equality of means is at least 0.90? Use 0.05.

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