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Earn +20 ptsQ: Why is it difficult to obtain a representative sample?
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Why is it important to have a representative sample when doing surveys?
Because without representative sample, your results will not be valid.
What is a representative sample?
A sample that accurately reflects the characteristics of the population as a whole
How can you determine whether a sample is representative of a population?
Take a simple random sample.
What is represenatative sample of population?
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.
What is the importance of a representative sample?
Well, if your sample does not represent the larger sample, you'll certainly not get a valid result ... For example, if you're studying pregnancy and your sample includes men - The whole idea of "representative' sample is fuzzy and often gives interesting errors.
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