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If I obtain a simple random sample of 60 students at my school and 45 reply...

If I obtain a simple random sample of 60 students at my school and 45 reply to a survey from this sample. Will the 45 students be considered an SRS from the population of 60 students?

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Solution: The 45 students who replied to the survey from this sample will be considered simple random sample but not from the population of 60 students. The 60 students were randomly selected from the sample, so these 60 students were the intial sample of the survey and only 45 replied to the survey. So these 45 students who responded to the survey would be considered as the simple random sample from the population of school students but not from the population of 60 students.

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