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Survey is a type of statistical method of collecting data. This is very important in the field of psychology. Sampling, census etc. are some other methods of collecting data.
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There are many such methods: cluster sampling, stratified random sampling, simple random sampling.Their usefulness depends on the circumstances.
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Quota sampling stratified sampling random sampling convenient sampling cluster sampling semi stratified sampling stratified quota
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random sampling ,systematic sampling , self-selected , and there is one more i don't know
briefly, the methods you will use to monitor marketing effectiveness and performance
There is no sampling method that will select the exact population.
Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.
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Amniocentesis and chorionic villi sampling.