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Assuming the following data for a population of 800 elements distributed into 4 stratum: Stratum Size Variance cost per unit h Nh ($) 1

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Assuming the following data for a population of 800 elements distributed into 4 stratum: Stratum Size Variance cost per unit h Nh ($) 1 150 64 0.2 2 230 81 0.1 3 320 25 0.4 4 100 100 0.9 ) If we plan to use a Stratified Random Sample to make an estimate of (average). a) Compute: The the allocation that will yield the estimated mean having the lowest standard error at fixed cost of sampling (C=$1000): b) What is the sample size at this study?

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