Which variable listed below is the variable manipulated by the researcher,thereby causing an effect on another variable?

Name: Which variable listed below is the variable manipulated by the researcher,thereby causing an effect on another variable?
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Question

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The predictor variable is the variable manipulated by the researcher, which causes an effect on another variable. The other variables listed are not manipulated by the researcher, but are either measured or influenced by the predictor variable.

Which Variable Listed Below Is the Variable Manipulated by the Researcher,thereby