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A researcher wants to know if a new sports drink improves physical performance. participants are first measured on the number of sit-ups they can complete in one minute. the participants are then given eight ounces of the new sports drink, and then the number of sit-ups completed in one minute is again measured. the researcher finds that the number of sit-ups completed is less after versus before consuming the new sports drink. this finding is likely a result of a

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The answer is cluster sampling. The cluster sampling denotes to a kind of sampling technique in which with cluster sampling, the researcher distributes the population into distinct groups named clusters. Then a simple random sample of clusters is carefully chosen from the population and the researcher evaluate the analysis on data from the tested clusters.

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