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To implement a random sampling method, every member of the study population of interest from which the sample size was determined must be listed in sequential order. This list is referred to as the sampling frame. Each member comprising the sampling frame is referred to as a sampling unit. These sampling units are then randomly chosen from among those in the sampling frame, using either a table of random numbers or an automated random number generator, until the required sample size is met.
This calculator is used in Section 4: Sampling Plan, Sample Size section of the surveillance plan.