Which one of the following is typically an example of an "informal research" technique?

Question

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Key informant interviews are considered an informal research technique because they involve a conversation between the interviewer and a person who is knowledgeable about the topic being studied. This method is less structured and more flexible than other techniques such as RDD telephone surveys, mailed questionnaires, and random sample surveys. Content analysis, on the other hand, is a method used to analyze textual or visual content in a systematic and objective way, which may be considered more formal than key informant interviews.

Which One of the Following Is Typically an Example of an "Informal