Question: For the supermarket example in Section 6.1, suppose that the is are 7/16 for store A, and 3/16 for each of stores B, C, and

For the supermarket example in Section 6.1, suppose that the ψi’s are 7/16 for store A, and 3/16 for each of stores B, C, and D. Show that ṫψ is unbiased, and find its variance. Do you think that the sampling scheme with these ψi’s is a good one?

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