Suppose that there are five categories of plumbers (individuals, small local businesses, home renovation companies, condo renovation
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Suppose that there are five categories of plumbers (individuals, small local businesses, home renovation companies, condo renovation companies, and high rise construction companies). A plumbing supply company would like to gather data on quality of different product manufacturers. They randomly select 20 names from each category - Whar this sampling method is called (enter one word only) ?
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