We have an interaction in an experiment whenever o An extra

• We have an interaction in an experiment whenever:

o An extraneous variable systematically changes with the dependent variable.

o An extraneous variable systematically changes with the independent variable.

o The effect of one independent variable changes across levels of another independent variable.

o There are two or more independent variables in the same experiment.

Solution

Answer: An extraneous variable systematically changes with the independent variable

Reason:

Confounding:

The confounding the phenomenon that could be potentially observed in the experiment due to interaction or a wreak that causes interaction or havoc within the results of experiment & it is due to effects of extraneous variable systematically trigger changes with the independent variable finally threat to internal and external validity of experiment