To get an impartial sample where everyone carries an equal opportunity of being chosen, do a random selection by using one of the methods described below. So, whom do your survey? Will that be 100 newest customers, or the first 100 customers listed alphabetically, or 100 people with the shortest names? None of these approaches fit your needs because they are innately biased. Obviously, it would be unwise to send out a questionnaire to each single person in your multi-thousand database. Why would you need one? Basically, to get a non-biased representation of the total population.įor example, you want to conduct a little survey among your customers. Each element of a random sample is chosen entirely by chance and has an equal probability of being selected. In probability theory and statistics, a random sample is a subset of data selected from a larger data set, aka population.
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