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Cluster sampling examples. Example 1: Assume that a study with relatively large square fixed area plots of 50 m x 50 m had been carried out, on which all tree positions were mapped. Because the individual plots were relatively large, there were only resources available to measure \(n=10\) sample plots.
Under those assumptions, the sample size estimator at Survey Monkey says you will need a sample size of 385 for a population of 1,000,000. https://www.surveymonkey.com/blog/en/sample-size-calculator/.