Please help, i don't really get what it's for! Thanx in advance
xxx|||the control is used so that you have something to compare the results of your experiment to. The control is unchanged throughout the experiment.|||The control is for two things.
One, it will confirm that the experiment works as it should (e.g. in a bacterial experiment, a control can confirm sterility of the growth media).
Also, a control will give you the "zero response" if you use it for a calibration, in which case it is also known as a blank.|||control variables establish baselines. There are expected statistical results from the status quo %26amp; they should be accounted for prior to altering the test poulation.|||There are 3 variables which can be identified:
-manipulated variable: factors which are changed during experiment
-responding variable: factors that change according to changes in manipulated variable
-fixed variable: factors which does not change at all during experiment
In a scientific investigation, one variable is manipulated to study its relationship with a responding variable.
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