A researcher wants to determine a possible cause for a very rare medical disorder, so he flies around the world and interviews the four children who have the disorder. As he interviews each child and his or her family, the researcher is looking for common things that happened to each of these children that might give him clues as to what caused the disease. What type of research is he conducting?

Question

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The researcher is conducting a case study, as he is examining a small group of individuals with a rare disorder in depth to find commonalities that might explain the cause.

A Researcher Wants to Determine a Possible Cause for a Very