A control can either provide a baseline, show that the experiment is specific for the variable or show that the experimental procedure works.
So if you want to determine if having more enzyme degrades sugar faster you include a control that you know will degrade sugar at a certain rate. Then you compare what happens in the control and in your sample with more enzyme you can see if your hypothesis is correct.
When multiplying DNA by PCR one often uses a negative control (an organism without the gene and/or water) to show that you only multiply what you think you are multiplying and a positive control (a previously isolated piece of the DNA) to show that the PCR was successful even if none of the other samples amplified a fragment.
Attempt to control the conditions
Attempt to control the conditions
It can be rejected if there is no control variable.
Set up an experiment and a control group, which has an independent and a dependent group
To eliminate the possibility of hidden or unknown variables the scientist must a control experiment.
Attempt to control the conditions
Attempt to control the conditions
control variable
a control group assures that an experiment will be repeatable
It can be rejected if there is no control variable.
Set up an experiment and a control group, which has an independent and a dependent group
To eliminate the possibility of hidden or unknown variables the scientist must a control experiment.
Because it helps them know the results of the objects in the experiment and how they differ. This way the scientist knows which succeeded and which failed.
use a control
Observing an experiment
If they can't do a controlled experiment chances are they're advanced and know what they're doing. Depending on the experiment itself, the scientist would have to come up with a procedure that doesn't involve a control. Although there may be no official control, they probably still compare the results to something.
The variable is an experiment that is manipulated by the scientist. APEX