In general, when conducting an experiment, the experimenter should treat all participants the same except for the: levels of the moderating variable(s) levels of the extraneous variable(s) levels of...

In general, when conducting an experiment, the experimenter should treat all participants    the same except for the:

1. levels of the moderating variable(s)


2. levels of the extraneous variable(s)


3. levels of the mediating variable(s)


4. levels of the independent variable(s)