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Explain why Dr. Garcia's chosen method of recruitment might compromise the validity of her study's sampling design. Specifically, explain how this method limits her ability to obtain a random sample, and name the alternative online recruitment method she could have used to better control who receives the survey invitation.
Case context: A developmental psychologist, Dr. Garcia, wants to study parenting styles among modern parents. Due to a small research grant, she chooses to administer an internet survey to keep costs low. To recruit participants, she posts links to her survey on parenting blogs and online forums.
Question: Explain why Dr. Garcia's chosen method of recruitment might compromise the validity of her study's sampling design. Specifically, explain how this method limits her ability to obtain a random sample, and name the alternative online recruitment method she could have used to better control who receives the survey invitation.
Sample answer: Dr. Garcia's method of posting links on parenting blogs and online forums limits her ability to obtain a truly random sample because it relies on voluntary self-selection of individuals who visit those specific websites, rather than a randomized selection process. To have better control over the sampling frame, she could have used the alternative online recruitment method of sending email invitations directly to a randomly selected list of parents.
Key points:
- Posting links on websites like blogs and forums makes it difficult to obtain a truly random sample.
- An internet survey is a low-cost administration mode.
- Sending email invitations is the alternative recruitment method that allows for more controlled targeting of participants.
Rubric: The response should demonstrate comprehension by explaining that posting links on websites leads to self-selection rather than random sampling, and identifying email invitations as the alternative method that offers more control over the sample.
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Research Methods in Psychology - 4th American Edition @ KPU
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