A school district has eight elementary schools, four middle schools, and two high schools. The district’s IT manager wishes to survey teachers regarding the use of technology in the classroom. Which of the following designs would create appropriate strata?

Stratified sampling divides the population into relevant groups, then randomly samples from every group. In choice C, each school is a group, and four teachers are chosen at random from every school, representing all levels and campuses. Choices A and D survey only one school level, while B samples from only one grade level, so they leave out much of the district.

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