Aresearcher's efforts to remove influence of variables other than the independent variable is referred to as

Control

Explanation:

Control in research refers to setting up a certain group or implementing certain measures to ensure that the only variables influencing the outcome are the independent variables which have been included in the research. It is done to remove influence of extraneous variables. Extraneous variables are those which can affect the outcome of the research but have not been included in the current investigation for different reasons. Controls are of prime importance in medical research.

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