When selecting a sample for study,a researcher must be careful to:

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It is crucial for a researcher to select a sample that is representative of the population they are interested in generalizing their findings to. This helps to ensure the external validity of their study. While some studies may focus on specific demographics (such as gender or age), it is not necessary to limit a sample to these characteristics unless they are relevant to the research question. It is not ethical to exclude certain groups from participation solely based on demographics, and offering large incentives can bias the sample towards those who are primarily motivated by the reward rather than an interest in the study. Similarly, recruiting participants from unrelated disciplines does not necessarily guarantee a representative sample for the researcher's purposes.

When Selecting a Sample for Study,a Researcher Must Be Careful