Controlled experiments have three types of variables: dependent, independent and controlled. Independent variables, also called manipulated variables, are altered during an experiment. The resulting measurable change is the dependent, or responding, variable.
To avoid experimental error, all factors other than the dependent and independent variables are standardized and referred to as controlled variables. For example, an experiment that measures the time it takes for a candle to burn down would control variables such as wind and type of candle by conducting the test in the same windless area with the same kind of candles. The independent variable for this example is the amount of time, while the dependent variable is some other measurable aspect such as height that notes the change in the candle as it burns.Learn More
Manipulated variable refers to variables in an experiment or testing environment where a variable is manipulated to test for a change in outcomes. Manipulated variables are used in many different scenarios, including computer programming, system testing and drug testing.Full Answer >
Constants in an experiment refer to things that do not change when repeating trials in the experiment. The two primary types of constants are physical constants and control constants.Full Answer >
In a science project, the data analysis process occurs after a person performs an experiment to determine whether the hypothesis, an educated guess, is true or false. Analyzing the data consists of reviewing, calculating and charting the results of the experiment.Full Answer >
The problem in a science fair project is the scientific question that the experiment attempts to answer. It should be phrased as a question and begin with a question word such as "how" or "why."Full Answer >