A Researcher Has Designed a Study Looking at the Effects

A researcher has designed a study looking at the effects of peer support on outcomes of coronary artery bypass graft (CABG) patients. In designing the study, the researcher randomly assigns some patients to a group who will receive support from a recovered CABG patient and some patients to a group who receive no formal support from another CABG patient. This process would be an example of which of the following?

A) Bias
B) Manipulation
C) Multicausality
D) Probability

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