A population of size 500 is divided into 4 strata. The following table gives the (5)
data on size and standard deviation of each stratum.
STRATA
I II III IV
Size 100 150 150 100
S.D. 5 8 7 10
A stratified random sample of size 100 is to be drawn from the population.
Determine the size of samples from each of these strata for:
i) proportional allocation
ii) Neyman’s optimal allocation
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