An example of a controlled experiment?

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

An example of a controlled experiment is making sure your work is under control.

Answer 5

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.

Answer 6

the controlled variable is whch should be kept constant in the experiment so that we can get accureate results