Non-Probability Sampling

INFO

random selection is not performed, not all individuals can be selected

• Types of non-probability sampling

Convenience method

• individuals who are readily available to the researcher are part of the sample
• easy, quick, and cheaper way of obtaining data
• Example
  • professor could ask students to complete survey right after lecture
  • most convenient way to gather information from all attendees

Voluntary Sampling Method

• people volunteer to participate in the survey instead of the researcher selecting the participants
• Example
  • news reporter asked viewers to go to the news channel website and fill out an online survey

Purposive Method

• researcher selects respondents who are specific to the topic of research
• Example
  • researcher wants to know how the university treats disabled students
  • only select students with disabilities to fill out the survey

Snowball Method

• used when finding respondents is difficult
• in this case one respondent helps the researcher to get in touch with more individuals who can help in the survey
• Example
  • researcher needs to find out the issues that homeless people undergo
  • find 1 individual who can put them in touch with several other homeless people