Assume that T-Mobile is interested in studying the pricing expectations of its customers. If the study calls for selecting at random 100 people from each of three age groupings, ____ sampling is being used.

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Stratified sampling involves dividing a population into subgroups (in this case, age groupings) and then selecting a random sample from each subgroup. This method ensures that each subgroup is represented proportionally in the sample, which can provide more accurate information about the population as a whole.

Assume That T-Mobile Is Interested in Studying the Pricing Expectations