Question

Justify the need for a control in an experiment. Use complete sentences

Answer 1

Control is very important if you want to have any results in your experiment. Control is the element in an experiment that is performed without manipulation of any variables. To have control, means nothing has been changed and no treatment is applied.

In every investigation during your experiment, you need to have a minimum of one run of the experiment where you don't change ANYTHING. This is called the control. You use the results of this control experiment to compare the results that you get when you do change something. For example, if we are conducting an experiment on how the weight gain of a horse changes with the addition of protein, the amount of the protein would be the independent variable (x value), and weight would be the dependent variable, (y value). How would we know if the weight gain was normal or due to the addition of the protein? Without the control experiment to compare to, you wouldn't know if the measurements you got were normal, or due to the addition of the protein.

Step-by-step explanation:

Hope it helped!

Answer 2

The control is necessary to make sure that you can tell the difference between the regular, non changed experiment, and the change that happens.
Basically, the control helps you to measure, or observe, the difference in experiments.

And example would be using pills, or flavor water, to see how it affects people.
The control would be the group that either doesn't receive pills or water. This is basically to see how it is normally. The norm.