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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.
A good example of probability sampling technique is simple random selection. For example in the above study, if you had a list of all the medical students of Pakistan, you could randomly select the students (total number based on your sample size calculation) and have them fill the study questionnaire.