how are rival causal factors controlled in research design
Basic Research
yes
experiment
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Hhh
Yes.
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The three main methods of research are experimental research (conducting controlled experiments to test hypotheses), descriptive research (observing and describing behaviors or characteristics), and correlational research (examining the relationships between variables without manipulating them).
I believe it was Songhai but i did not research this at all I am counting on Civ V.
Experimental Method