RESEARCH METHODOLOGY

Detailed explanation-1: -This is common for samples that need people who meet specific criteria, as is often the case for medical or psychological research.

Detailed explanation-2: -Voluntary response sampling Similar to a convenience sample, a voluntary response sample is mainly based on ease of access. Instead of the researcher choosing participants and directly contacting them, people volunteer themselves (e.g. by responding to a public online survey).

Detailed explanation-3: -Voluntary sampling occurs when researchers seek volunteers to participate in studies. Volunteers can be solicited in person, over the internet, via public postings, and a variety of other methods. A researcher using voluntary sampling typically makes little effort to control sample composition.