You calculate these by dividing your population size by the desired sample size. To start your systematic sample, you first need to divide your sampling frame into a number of segments, called intervals. Any of these can be used as a sampling frame. This method is useful in situations where records of your target population already exist, such as records of an agency’s clients, enrollment lists of university students, or a company’s employment records. Systematic sampling draws a random sample from the target population by selecting units at regular intervals starting from a random point. In this case, since children from urban areas form 80% of the population, you will have to weigh their results four times more than those of the children from rural areas. If you choose an equal number of units, keep in mind that you need to weigh the results in order to draw conclusions for the population as a whole. Then, you can continue with your data collection (e.g., ask them to fill in a questionnaire).
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