For the supermarket example in Section 6 1, suppose that the i s are 7 16 for store A, and 3 16 for each of stores B, C, and D Show that is unbiased, and find its variance Do you think that the sampling scheme with these i s is a good one ...

As shown in 63 for the general case Using 64 This is a poor s ...

For the supermarket example in Section 6.1, suppose that the i s are 7/16 for store

Question:

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