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Which of the following statements is true about using samples for research studies instead of entire populations?


Using a sample is more expensive, because more care must be taken selecting subjects.

Using a sample is more time-intensive, because more care must be taken selecting subjects.

Using a sample is more wasteful, because data about the rest of the population is not included.

Using a sample is more accurate, because more care must be taken assessing each response.

Please help!