What is a controlled experiment?

Question

What is a controlled experiment?

Answer 1

u control the environment and stuff

Answer 2

your question was the topic of my teacher yesterday

so this is my answer

A scientific investigation in which variables are controlled is a controlled experiment.  In its simplest form, a controlled experiment is done when the investigator consciously changes one variable (the independent or manipulated variable), which will likely cause another variable to change (dependent or responding variable). To the extent possible, all other variables are kept the same (constants).  

A good problem question for a controlled experiment can usually be phrased in this form: How does one thing (independent variable) affect another thing (dependent variable)?  Consider the following example: “How does the temperature of water affect the ability of sugar to dissolve?“ We might do some preliminary research that tells us that, generally, an increase in temperature leads to increased solubility but there are exceptions. We could form a hypothesis from that preliminary research that “if we increase the temperature of water then more sugar will dissolve.” The temperature of water is the independent variable.  We can further define the levels of the independent variable by selecting discrete temperatures for testing, i.e., 0o, 25 o, 50 o, 75 o, etc. We could further designate 25 o as our control group (25 o Celsius is a standard temperature used in many chemistry problems). Three levels is a bare minimum. We can measure the dependent variable by keeping a record of the number of teaspoons or the grams of sugar that dissolve in each sample of water.  In order to get a fair test, you would want to keep all variables other than the temperature of the water constant: For example we would want to see if different amounts of sugar dissolve in the same amounts of water and in the same kinds of containers.  It would not be fair if you used a small amount of cold water and a greater amount of hot water. The problem question could not be answered because we would not know if the higher temperature or the greater volume of water caused the differences in solubility.  Lastly, because measurement is always imperfect and human error common, we would need to perform our experiment several times (trials), or use a large number of samples of each of the levels of the IV, and look for trends within the data collected in order to draw meaningful conclusions.  

so that's it

hope you will get a high scores of that

Answer 3

An experiment that's totally under your control, girl friend!

Answer 4

one in which the experimental group which is to be subjected to a treatment or change in management is matched with a group which is very similar in every way except with respect to the variable that is to be manipulated.

Answer 5

An experiment where all the other variables, exept the one you are testing, are controled. (i.e Tempereture is constant, light, etc