_____refers to researchers 'allocation of participants to groups by chance, "to reduce the likelihood that an experiment's results will be due to preexisting differences between groups.

A.Selection bias
B. Experimenter bias
C. Random assignment
D. Random selection

In order to carried out Random assignment, the researchers usually will categorize the subjects into numbers. (subject 1, subject 2, etc) When separating them , they can make the subjects pick a letter from some sort of ballot to designate their group , or They can use random number generator software to separate the subjects.

Researchers with bad intentions could carefully hand pick the subjects in order to manipulate the conclusion of the research. Random assignment is used to prevent such thing from happening, and ensure that the result of the experiment is not systematic.

_____refers to researchers 'allocation of participants to groups by chance, "to reduce the likelihood that an experiment's results will be due to preexisting differences between groups. A.Selection bias B. Experimenter bias C. Random assignment D. Random selection

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_____refers to researchers 'allocation of participants to groups by chance, "to reduce the likelihood that an experiment's results will be due to preexisting differences between groups.

A.Selection bias
B. Experimenter bias
C. Random assignment
D. Random selection