The population consists of two strata h and l of sizes, Ask an Expert

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The population consists of two strata, H and L of sizes 100,000 and 500,000 and standard deviations 20 and 12 respectively. A stratified sample of size 100 is to be taken.

a. find the optimal allocation for estimating the population mean.
b. find the optimal allocation for estimating the difference of the means of the strata, μh-μx

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