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3 votes
A kind of variable that a researcher purposely changes in an investigation is...

constant.
controlled.
dependent.
independent.
help please(:

User Swaraj
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1 Answer

4 votes
A kind of variable that a researcher purposely changes in an investigation is a "independent variable", since this is what is changed to see what effect the change has on the "dependent variable". 
User OussaMah
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