The independent variable.
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Where you control the variable factors that involve conducting the experiment.
Experiment: the act of conducting a controlled test or investigation.
False
False
False
A closely controlled perimeter.
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With controlled experiments it is taken into consideration what possible variables there could be and it is taken into account when conducting the experiment. This would mean that controlled experiments would produce more valid data.
Conducting the study as a double blind. ie. the participants don't know which group they're in but nor does the researcher.
independent variable
Not technically, you can disprove it. And you can narrow the probability of the null hypothesis but proof by experimentation alone is not possible.