Which of the following methods is characterized by low levels of control in the data collection process?

Question

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Mail surveys are characterized by low levels of control in the data collection process as the researcher has little or no control over who fills out the survey or how it is filled out. This can result in incomplete or inaccurate responses. Personal interviews and focus groups provide higher levels of control as the researcher can observe the respondent and clarify any confusion in real-time. Telephone interviews provide some level of control as the researcher can ask follow-up questions, but there is still a lack of control over the respondent's environment and potential distractions.

Which of the Following Methods Is Characterized by Low Levels