Samples of unknown representativeness are typically the major problem with which one of the following research methods?

Question

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Exploratory methods are used to gather preliminary information about a topic or problem, and often involve small, non-random samples. Because the samples are not necessarily representative of the larger population, the findings may not be generalizable or accurate. Therefore, the major problem with exploratory methods is often the representativeness of the samples.

Samples of Unknown Representativeness Are Typically the Major Problem with Which