Samantha posted an advertisement on the Internet requesting single mothers to participate in a research study on single parenting. She found that those who signed up for the study were better educated and earned a higher income than average. This demonstrates:

Question

Quizplus · Accepted Answer

Volunteer bias occurs when the individuals who choose to participate in a study have different characteristics than those who do not, potentially skewing the results. In this case, the single mothers who volunteered were better educated and had higher incomes, indicating a volunteer bias.

Samantha Posted an Advertisement on the Internet Requesting Single Mothers