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Stratified Sampling Essay Preview: Stratified Sampling Report this essay Strata: Proportion Of Variability Of Data Gathering Cost Retail Enviroment Type Customers Expenditure Per Respondent Online Grocery Retailer 0.13 23 0.5 Supermarket 0.62 13 1 Small Grocer 0.11 4 2 Corner Shop 0.05 2 4.5 Daily Food Market 0.09 3 2 p x var p x.