Show that if an SRS of size n(1) is taken in phase I, and an SRS of

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Show that if an SRS of size n(1) is taken in phase I, and an SRS of size n(2) is taken in phase II, then taking the ratio n(2) / n(1) in (12.20) minimizes the variance in (12.10) for a fixed cost C. Discuss.
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