It seems that there's a bit of confusion in your response regarding the identification of the population and the sample.
To clarify:
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Population: This refers to the entire group you're interested in studying. In this case, the population is all 124 gym members.
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Sample: This refers to the subset of the population that has been surveyed or studied. Here, the sample is the 68 gym members who responded to the online survey.
So the correct identification would be:
Population: 124 gym members
Sample: 68 gym members who responded to the survey