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Mathematics, 04.03.2021 03:40 nashville9678

A band director is trying to decide what music to play for the halftime show. To get a sample, the director divides the band into groups based on their grade (freshmen, sophomores, juniors, and seniors). Then she randomly chooses a group and surveys every member of the chosen group. Which sampling method was used? cluster sampling
simple random sampling
stratified random sampling
systematic random sampling helo​

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