Examlex
The combining form andr/o- means ________.
Nonexperimental Methods
Research designs that do not involve the manipulation of variables or random assignment of participants.
Randomization
Controlling for the effects of extraneous variables by ensuring that the variables operate in a manner determined entirely by chance.
Experimental Control
Eliminating the influence of an extraneous variable on the outcome of an experiment by keeping the variable constant in the experimental and control groups.
Spurious Relationship
A false association between two variables that appears to be causally linked but is actually due to an extraneous variable.
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