Stratified sampling examples

Example 1

Illustration why stratification is most efficient when the strata meansare as different as possible

Imagine the example population of \(N=30\) elements be subdivided into three strata as in the figure on the right. Here, stratification has been done arbitrarily into three strata of size 14, 8 and 8. From this stratified population, we wish to take a sample of n=10, taking n1=4 from the first stratum and n2=n3=3 from the other two strata. The stratum parametric means and variances are given in Table 12.

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