Finall Answer:
A focus group corresponds to a qualitative research design, while an experiment aligns with a quantitative research design, and an online survey often utilizes a mixed-methods approach.
Step-by-step explanation:
A focus group typically falls under qualitative research as it involves gathering insights and opinions from a small group of individuals to explore perceptions, attitudes, and experiences. Conversely, an experiment is associated with quantitative research, aiming to establish causality through controlled conditions, variables, and measurable outcomes.
An online survey can encompass a mixed-methods approach, combining qualitative and quantitative elements by gathering both open-ended responses and structured data from a larger sample size. This method allows for broader data collection while maintaining some depth of insight, depending on the nature of questions and response options provided.