Suppose that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2

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Suppose that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed.

a. What type of sampling should you do? Why?

b. Explain how you would carry out the sampling according to the method stated in (a).

c. Why is the sampling in (a) not simple random sampling?

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a A stratified sample should be taken so that each of the four ...View the full answer

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