Final answer:Conductingascientific experimentis aformal research method, whereas interviewing the target audience, looking in company files, and brainstorming for ideas are typically informal research methods. It's important to use an appropriate method or a mix of methods based on the research objective.Explanation:All methods mentioned in the question are generally informal methods of conducting research except for one -conducting a scientific experiment. In doing so, the researcher follows a rigorous and formal method involving a systematic, theoretical and empirical investigation of observable phenomena.On the other hand, interviewing the target audience, looking in company files, andbrainstormingfor ideas are typically informal methods of research. They are less rigid, rely largely onpersonal judgment, and can be subject to bias. For example, while interviewing a target audience can provide useful insights, its informality may mean the responses are skewed due to individual biases or interpretations of the question.While all these methods can provide valuable data for research, it's important to ensure the correct methodology is employed based on the research objective and the depth of understanding sought. A mix of formal and informal research methods is often recommended to get an accurate and in-depth perspective on the research topic.Learn more aboutResearch Methodshere:brainly.com/question/5292173#SPJ11...

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