Dr. Jackson is a personality psychologist who is interested in studying the characteristics of people who report being abducted by UFOs. She finds several people in a support group to research and asks them if they can provide the names and contact information of other people who have also been abducted. Upon contacting these new participants, she asks them to refer her to even more people they may know who have been abducted. This is an example of what kind of sampling?1. Self-selection sampling2. Snowball sampling3. Purposive sampling4. Convenience sampling

Explanation: Snowball sampling refers to a research in which once participants behave been recruited for a study they can also recruit other participants that they know. This is useful when it is hard for a researcher to find potential participants. The name of this research comes from the fact that when you roll down the ball made from snow it will pick up some other particles along the way and it will keep getting bigger and bigger.