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because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
A random sample is better than a census because it takes less time and costs less.
You can sample when carrying out a comprehensive census is not feasible for any reason. It may be because a census would require too many resources (including time), be destructive (eg life span of light bulbs).
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
Less time and less cost for a sample.