Question

a convenience sample differs from a voluntary sample in that

• a convenience sample is structured based on accessibility to the researcher, and a voluntary sample is based on participant interest.
• convenience samples survey each participant once, and voluntary samples survey each participant numerous times.
• convenience sampling is a method of random sampling, and a voluntary sample is not.
• convenience sampling is not a probability - based method, and voluntary sampling is.

Explanation:

A convenience sample is formed by selecting individuals who are easily accessible to the researcher. A voluntary sample consists of individuals who choose to participate out of their own interest. The other options are incorrect as the number of surveys per - participant is not the differentiator, convenience sampling is not random sampling, and neither is a probability - based method.

Answer:

A. a convenience sample is structured based on accessibility to the researcher, and a voluntary sample is based on participant interest.