# What are manipulated variables in an experiment?

Responding (or Dependent) Variable: This is the variable that changes as a result of the changes in the manipulated variable. In our fertilizer example, the responding variable would be the size of the plants. Controlled Variables (or Controls): These are all the things that you will keep the same in your experiment.
A.

### What is the definition of manipulated variable?

A manipulated variable is the independent variable in an experiment. It's called “manipulated” because it's the one you can change. The controlled variable is the one that you keep constant. The responding variable or variables is what happens as a result of the experiment (i.e. it's the output variable).
• #### What is the controlled variable in an experiment?

The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation. The control variable itself is not of primary interest to the experimenter.
• #### Why is it important to have more than one trial in an experiment?

When we do experiments it's a good idea to do multiple trials, that is, do the same experiment lots of times. When we do multiple trials of the same experiment, we can make sure that our results are consistent and not altered by random events. Multiple trials can be done at one time.
• #### Is the independent variable manipulated?

In an experiment, the researcher is looking for the possible effect on the dependent variable that might be caused by changing the independent variable. Independent variable (IV): Variable the experimenter manipulates (i.e. changes) – assumed to have a direct effect on the dependent variable.
B.

### What is the controlled variable in an experiment?

The control variable (or scientific constant) in scientific experimentation is the experimental element which is constant and unchanged throughout the course of the investigation. The control variable itself is not of primary interest to the experimenter.
• #### What are the different types of variables?

There are three main types of variables in a scientific experiment: independent variables, which can be controlled or manipulated; dependent variables, which (we hope) are affected by our changes to the independent variables; and control variables, which must be held constant to ensure that we know that it's our
• #### How many dependent variables can there be?

A well-designed experiment normally incorporate one or two independent variables, with every other possible factor eliminated, or controlled. There may be more than two dependent variables in any experiment.
• #### Which variable can be manipulated?

An experiment generally has three variables: The manipulated or independent variable is the one that you control. The controlled variable is the one that you keep constant. The responding variable or variables is what happens as a result of the experiment (i.e. it's the output variable).

Updated: 3rd December 2019

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