What term is used for the original group of participants studied to develop a new psychological test or assessment tool?

Question

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The term used for the original group of participants studied to develop a new psychological test or assessment tool is the construction sample. This sample is used to create the initial version of the test, which is then refined and validated using larger samples in subsequent studies. The other options (A) source sample, (B) control group, (D) psychometric group, and (E) participant pool are either not relevant or not specific enough to describe the construction sample.

What Term Is Used for the Original Group of Participants