Dr. goodfree decides not to tell her research participants about the real reason for the study as she wants to see how participants will react to a perceived threat to their well-being. dr. goodfree’s decision is considered what type of deception?

deception by omission.

Explanation:

According to my research on different types of deceptions, I can say that based on the information provided within the question  Dr. Goodfree’s decision is considered deception by omission. This refers to deceiving an individual or group by withholding certain specific information. Which is exactly what Dr. Goodfree is doing to his research participants.

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  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.