this is brief, but a census gathers data from the whole group/poulation, wheras a sample investigation on takes a small part of the group/poulation, a sample
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A sample survey is asked of a limited group of people, while a census is conducted in an attempted to get an answer from all people in a geographical area.
sample is a noun and sampling is TO sample(verb)
a sample is a sample sized piece given... a sample size is the amount given in one sample
A population survey, better known as a census, entails the collection of each unit in the population. In sample survey information is collected from a subset of the population. The subset, or sample, needs to be selected carefully so that it is representative of the whole population and, if that requirement is met, statistics based on the sample are good estimators for the corresponding population parameters.
A random sample is better than a census because it takes less time and costs less.