Starbucks has decided to ask every customer that looks like they are a coffee addict if they would be interested in pre-ordering and pre-paying for their drink before they arrived at the store, so they did not have to wait in line. The decision to choose every third customer is an example of:

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Choosing every third customer is an example of sampling, as it is a method of selecting a portion of the population (in this case, the customers) to be observed or surveyed. Starbucks is using this method to test the idea of pre-ordering and pre-paying for drinks, without having to ask every single customer.

Starbucks Has Decided to Ask Every Customer That Looks Like