Which survey type is usually biased because those likely to respond have had especially positive or negative experiences with a given product,service,or brand?

Question

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The mail survey is usually biased because those who are most likely to respond have had especially positive or negative experiences with a given product, service or brand. This may skew the results of the survey, as it may not accurately represent the opinions and experiences of the wider population. Other survey types such as telephone, personal interviews, and focus groups may be less biased, as they allow for more interaction and clarification with the participants.

Which Survey Type Is Usually Biased Because Those Likely to Respond