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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.
1 Univariate data. 2  When we conduct a study that looks at only one variable, we say that we are working with univariate data. 3  Suppose, for example, that we conducted a survey to estimate the average weight of high school students.