A stratified sample is taken from a population of size $N=2000$ which consists of two strata of $N_{1}=800$, $N_{2}=1200, n_{1}=20, n_{2}=40, \sigma_{1}=3, \sigma_{2}=5$. Then the method of allocation is
A) proportional.
B) optimum.
C) neither proportional nor optimum.
D) both proportional and optimum.

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The Answer of A stratified sample is taken from a population of size $N=2000$ which consists of two strata of $N_{1}=800$, $N_{2}=1200, n_{1}=20, n_{2}=40, \sigma_{1}=3, \sigma_{2}=5$. Then the method of allocation is
A) proportional.
B) optimum.
C) neither proportional nor optimum.
D) both proportional and optimum.

A Stratified Sample Is Taken from a Population of Size N=2000N=2000N=2000

A Stratified Sample Is Taken from a Population of Size $N=2000$