A researcher measures people's blood type and tests whether those with different blood types have different personalities. This type of research is called a

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This is a correlation study as it is measuring whether there is a relationship between blood types and personalities. It is not an experimental study as there is no manipulation of an independent variable and no control group. Also, it is not a blind or case study as there is no blinding of participants or in-depth examination of an individual case.

A Researcher Measures People's Blood Type and Tests Whether Those