Question

which of the following is similar to \case study is to longitudinal study\?
experimental research is to experimental group
survey is to double blind study
naturalistic observation is to correlation coefficient

Explanation:

The original pair "case study is to longitudinal study" represents two distinct types of research designs (both are broad research methodologies). We need to find the option where both terms are separate, distinct research-related methodologies or designs.

1. "experimental research is to experimental group": Experimental research is a methodology, while an experimental group is a component of that methodology, not a separate research type.
2. "survey is to double blind study": A survey is a broad research methodology, and a double-blind study is a distinct research design (often used in experimental research), so this is a pair of separate research-related approaches, matching the structure of the original pair.
3. "naturalistic observation is to correlation coefficient": Naturalistic observation is a research method, while a correlation coefficient is a statistical measure, not a research design/method.

Answer:

B. survey is to double blind study