Researchers distinguish between two factors [related to sampling] that can reduce the validity of a study, sampling error, and sampling bias. Can you explain the difference between sampling error and sampling bias? How does each of these factors relate to validity

 Researchers distinguish between two factors [related to sampling] that can reduce the validity of a study, sampling error, and sampling bias. Can you explain the difference between sampling error and sampling bias? How does each of these factors relate to validity? How can researchers determine if sampling error or sampling bias is affecting a study? Finally, how might researchers best deal with sampling error and/or sampling bias?

 
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