A sample is a piece of information used to prove a point or detect something eg: Police take breath tests to see if people have been drinking alcohol they have taken a breath sample.
You should give/take a sample to find out things like what blood type you are or if you have a disease or even to find out if a woman is pregnant.
Some examples of samples are, blood tests, disease test, swab test, pregnancy test and so on.
To sample the right population is to see if they relate to your question.
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