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Basically a sample should reflect the population (Taylor, Farrell, 1994p. 118). There are ways in which a stratified sample can reflect a population. For example in our case of Tundra.com the stratified sample of size 300 can reflect the population (David P.
Best (1996.p166p). This is possible through ways such as: -
(ii) Using the variability of expenditure for each group we can compute sample proportion. This is through dividing the variability of expenditure for each group by the total variability and multiplying by the sample size of 300.
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