Why would the researcher want to use a sample or a population in this study?

Respond to the following:
On the basis of what you learned in the readings, define the terms “sample” and “population” and describe some of the advantages and disadvantages of using a sample compared to a population. Support your reasoning with examples.
A researcher is studying the effects of caffeine on e x a m scores of college students. In this study:
What would be the population and sample of this research? Extrapolate your views of the advantages and disadvantages of samples and populations to this example.
Why would the researcher want to use a sample or a population in this study?

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