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Joseph "Yellow Kid" Weil, a legendary professional criminal, operated by:
Double-Blind Experiment
A study or experiment in which neither the participants nor the researchers know who is receiving a particular treatment, in order to prevent bias.
Observational Study
A research method in which subjects are observed in their natural environment without any manipulation by the researcher.
Matched Pairs Experiment
A study design in which subjects are paired based on certain characteristics, with one subject in each pair receiving the treatment and the other serving as a control.
Observational Study
A study in which the researcher observes and records information on subjects without influencing the study outcome.
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