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Mean household income must be estimated for a town that

Mean household income must be estimated for a town that can be divided into three districts. The relevant information is shown in the table.

If a 95% confidence interval for the population mean extending $500 on each side of the sample estimate is required, determine how many sample observations in total are needed under proportional allocation and optimal allocation.

If a 95% confidence interval for the population mean extending $500 on each side of the sample estimate is required, determine how many sample observations in total are needed under proportional allocation and optimal allocation.

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