If researchers want to draw conclusions about an entire population, then why do they only use a subset of that population in their research investigations?

Name: If researchers want to draw conclusions about an entire population, then why do they only use a subset of that population in their research investigations?
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The Answer of If researchers want to draw conclusions about an entire population, then why do they only use a subset of that population in their research investigations?

If Researchers Want to Draw Conclusions About an Entire Population