You will try to control many extraneous variables in any experiment.
Many psychology and medical experiments will have a "Control Group" that has some kind of sham or placebo test, and an "Experimental Group" that receives the treatment you are testing. In medicine, if necessary the control group will receive the "standard of care".
So, for example, if you wished to determine whether Dramamine prevented motion sickness, you could take 100 people that don't go out to sea frequently. Give half of them a dose of Dramamine, and give half of them a sugar cube (making them all believe they had the same "active" medication). Send them out deep sea fishing and observe complaints of nausea, or actual vomiting attacks. Use statistics to determine whether the sugar cube group (control group) got different results than the Dramamine group (experimental group).
Control groups can be vital for analyzing epidemiological data. However, since the experimenter isn't personally manipulating the data, a lot of care must be taken to verify that a representative control group is chosen.
For example, say you choose to "smoking" as your experimental variable, and you wish to study divorce rate among smokers compared to non-smokers. You could not ethically take a group of people and require half of them to smoke, and half of them not to smoke. You would have to take a group of people, some of which smoke, and some who don't smoke, and then either follow them through the future, or study historical data about them to determine trends. However, you will quickly find there are many confounding variables such as socio-economic status which could affect the observed variable (divorce rate). So, you might look at only doctors in similar health fields. Or only engineers, etc to eliminate as many confounding variables as possible.
First, you have to understand the meaning to controlled variable (CV), or known as fixed variable (FV).
CV are something that should be the same throughout the experiment. Means that if that thing changed, the result of experiment at the end will become not accurate.
Here is an example in term of chemistry.
Lets say, you are going to conduct an experiment about Rate of Reaction by using Hydrochloric acid (HCl) and powdered calcium carbonate or calcium carbonate chips.
(I hope you know this kind of experiment, if not, you have to give me the name experiment that you conduct before.)
One of the procedure of the experiment I had mentioned just now are, to choose a same mass of calcium carbonate (in chip and powder) or same molarity (M) of HCl.
If you are using 5g of calcium carbonate chips, you have to use exactly 5g of powdered calcium carbonate in the next experiment.
OR
If you are using 1.0M of HCl in the first experiment, 1.0M of HCl have to use throughout the second experiment too.
OR
If you are using 50ml of HCl in the first experiment, 50ml of HCl have to use throughout the second experiment too.
In a nutshell, CV or FV were used to make sure the result of the experiment at the end are accurate.
Controlled variables are constant and does not change while manipulated variables are changed. In an experiment that measures how much water flows through a faucet, the controlled variable is the water pressure. The manipulated variable is how wide the faucet is open. In another experiment that tries to measure how fast a candle burns, the controlled variable is the wind and the type of candle used while the manipulated variable is the time measured in minutes.
An example of a controlled experiment is making sure your work is under control.
All experiments are controlled.
The independent variable is changed in a controlled manner and the dependent variable is measured; all other variables are kept constant or controlled.
the controlled variable is whch should be kept constant in the experiment so that we can get accureate results
Here is a helpful website that has a great example of a controlled experiment: http://scienceray.com/physics/controlled-experiment-example/?237567#comment-237567&reload
experiment
An experiment has to have a varible, if it doesn't that it's probably and engineering experiment or robotics. I think its called a "control"
a controlled experiment is an experiment that has an iv, dv, and a control, is in a well handled environment, and the experiment is safely done.
Controlled Experiment was created on 1964-01-13.
Here is a helpful website that has a great example of a controlled experiment: http://scienceray.com/physics/controlled-experiment-example/?237567#comment-237567&reload
controlled experiment
experiment
the answer is a experiment that is controlled
It is called a controlled experiment.
Pretty much having controlled variables. Controlled variables are something in the experiment that must remain the same through all tests. For example, if you are testing the decay of an apple... The temperature that the two fruits are enduring during the experiment must be the exact same.
An experiment has to have a varible, if it doesn't that it's probably and engineering experiment or robotics. I think its called a "control"
A controlled experiment is better than a none controlled experiment because you can control one of them and the other you can't. Science is a really fun subject.
A controlled experiment is an experiment in which all factors are controlled except for the one variable you will be altering. If you were performing a controlled experiment on the effects of fertilizer on plant growth, for example, you have to control plant variety, exposure to sunlight, soil type and water ration. The only thing you would change is the fertilizer used on each plant.
An investigation in science that is controlled is an experiment. The group within the experiment that is controlled is the control group.
a controlled group is like an idea but an experiment that is controlled cannot be changed.
A controlled experiment is an experiment where there are limited or no variables other than the one you are testing for.