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An observational study.
case study
it is a study which extracts lived experiences of the co-researcher that gives insights of the realities of life.
A Case Study
Pavlov
the populas
in an experiment, the researcher manipulates a variable
An observational study where the researcher only observes the "target population".
In an experiment, the researcher manipulates a variable.
Observational study
I believe what you're referring to is a double blind study. Where neither the researcher or the subjects know who has the placebo and who does not.
it is a study which extracts lived experiences of the co-researcher that gives insights of the realities of life.