Why does a researcher manipulate variables in an experiment?

Which element of the experimental design is the variable that is manipulated (added) in order to cause a change

Which element of experimental design is the behavior or mental process that is being measured

This group is not exposed to the independent variable

What is the purpose of random assignment?

Which group are the participants in if they are exposed to the independent variable?

What is the term for the procedure that ensures that neither the participants nor the researcher know who is in the control & experimental group?

Which group recieves the placebo?

If your hypothesis is not confirmed, it is called a

What are confounding variables?

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