Answer :
Manipulation of the independent variable directly, Extraneous variable control, Extraneous variable control, statistically correct for the variable's influence.
define experimental ?
relating to, based on, or having the nature of experiment: an experimental study. based on or derived from experience; empirical: experimental evidence. tending to experiment: an experimental artist. tentative or provisional: an experimental rule in football.
an experimental science. relating to, developed from, or founded on experiment: an experimental science. of the nature of an experiment; provisional:
The new software is still in the testing phase.
An experimental aeroplane is one that is in the process of being tested.
based on or drawn from experience; empirical: experimental knowledge.
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