Why are convenience samples used so frequently in nursing research? (Select all that apply.)
a. More subjects consent if they can understand the sampling method.
b. Obtaining a true random sample may be impossible.
c. There is low risk of sampling bias.
d. There are limited subjects available.
e. Nonrandom sampling affects only generalizability, not study integrity.
ANS: A, D, E
The majority of nursing studies use nonprobability sampling, especially convenience sampling, to select study samples. In conducting studies in nursing and other health disciplines, there are limited subjects available and often a random sample is not possible to obtain. Researchers often include any subjects willing to participate who meet the eligibility criteria. Nonrandom sampling affects only generalizability, not any other type of validity.
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