In a Research Study, When the Subjects Do Not Know

question 69

Short Answer

In a research study, when the subjects do not know who is in the experimental group and who is in the control group, but the experimenters do know, the study is called a(n) ____________________ experiment.
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Definitions:

Secondary Endosymbiosis

A chloroplast evolves from a red alga or green alga that was engulfed by a heterotrophic protist.

Primary Endosymbiosis

An organelle evolves from bacteria that entered a heterotrophic protist.

Chloroplast

A structure within the cells of plants and some other organisms that captures energy from sunlight and converts it into chemical energy through photosynthesis.

Archaea

A domain of single-celled microorganisms that are genetically distinct from bacteria and eukaryotes, often found in extreme environments.