the amount which would like to be achieved of how many people are in one place
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To generalize results from the sample population to the target population.
the sampled population includes all people whom are included in the sample, the targeted population is what the statistics practitioner is targeting or questioning
its time consuming and expensive if its a large sample you need or a big target population
it is non-random and prone to bias unrepresentative of target population
A probability sample is one in which each member of the population has the same probability of being included. An alternative and equivalent definition is that it is a sample such that the probability of selecting that particular sample is the same for all samples of that size which could be drawn from the population.