A population N is divided into three strata so that N1 = 5000, N2 = 2000and N3 = 3000. Respective standard deviations are: σ1 = 15, σ2 = 18, and σ3 = 5. How should a sample of size n = 84 be allocated to the three strata, if we want optimum allocation using disproportionate sampling design?

Biotechnology Engineering (M.Phil./Ph.D.) 2020 Panjab University Entrance Exam With Answers

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A: n1=50,n2=10andn3 =24

B: n1=28,n2=28andn3 =28

C: n1=50,n2=24andn3 =10

D: n1=54,n2=10andn3 =20

The answer is: C

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