Examlex
Personal income taxes are the largest source of revenue for the federal government.
Experimental Design
A procedure in research for testing hypotheses where one or more variables are manipulated to determine their effect on a dependent variable.
Independent Variable
The variable in an experiment that is manipulated by the researcher to examine its effect on the dependent variable.
Random Assignment
A method used in experiments where participants are allocated to different groups in a manner that is determined by chance.
Manipulated
Altered or controlled in a deliberate way, often used in the context of variables in experimental research.
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