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 selected based on ease of access for the researcher. For example, a researcher might survey people in a local park because they are readily available. A voluntary sample, on the other hand, consists of individuals who choose to participate, often because they have an interest in the topic. For instance, people responding to a call - out for a survey on a particular hobby.

• The second option about surveying once vs. numerous times is incorrect as it's not the key difference.
• Convenience sampling is not random sampling (so the third option is wrong).
• Neither convenience nor voluntary sampling is probability - based (so the fourth option is wrong).

Answer:

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