News cameras take an overhead picture of a part of a crowd at an outdoor event. Journalists then count the number of people in the picture and use the sample to estimate the total number of people in the crowd. This process is an example of

The journalists count everyone in one selected part of the crowd—the area shown in the overhead picture—and use that group to estimate the total. Sampling a whole group or section at once is cluster sampling. Random sampling would select individuals from across the crowd rather than count one area.

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