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What are the differences between census and sampling?
A census would get data from 100% of the population (or at least close to 100%). Sampling would be to get data from some of the population (much less than 100%).
Why its is necessary to use sampling in statistical investigation?
Sampling gives good insight of the choosen sample
When will you prefer sampling instead of census?
It is a judgment call based on the accuracy required, time allotted and costs. If you need data quickly, at a reasonable cost and time (of course depending on how many individuals there are in the population), you would take a sample. If the population is a reasonable number that all individuals in the population could be used, then go for the census.
Is questionnaire probability sampling technique?
A questionnaire has little to do with sampling technique. Sampling technique is to do with who gets the questionnaire and that can be any sampling technique: the questionnaire can be sent to everyone (census), to a random sample, stratified random samples, to random samples in clusters, by quota or convenience. Or a pile of questionnaires can be left for respondents to pick up - self-selection.
How do multistage sampling applies to real life situation?
Multistage sampling is a form of cluster sampling where instead of using the entire cluster, random samples from each cluster are used. This is typically used when doing opinion polls or surveys.
