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# Independent, Dependent and Confounding Variables

## Related Questions

❶How do you write in the third person about yourself? In the best experiments, the scientist must be able to measure the values for each variable.

## What Are Scientific Variables?

You place the container in a metal box and raise the temperature. The water is the dependent variable. If there is a cause and effect relationship between water and temperature, then the water will change with the temperature change.

And, of course, we know that the water will change from liquid into gas or steam with rising temperatures in the box. But what about that third type of variable used in scientific experiments? It is the control variable , also known as the constant variable. As the name suggests, it is the variable that the scientist wants to remain the same.

Often, there is more than one control or constant variable in a scientific experiment. The scientist will want to observe these control variables as much as the dependent variable. But why is this important? In our example above, what would be the control variable? The answer is air pressure. The same conditions must exist if we are to be able to predict the change in the water at a certain temperature. At high-level atmospheres, water boils or turns to steam at a lower temperature level than at normal air conditions.

Get access risk-free for 30 days, just create an account. Below is a line graph that shows where the data points would be shown for the dependent and independent variables in a study. Notice that the control variable is not represented in the line graph.

The y-axis represents the dependent variable, and the x-axis is the independent variable. In our example, the dependent variable, water, would be plotted on the y-axis, and the independent variable, temperature, would be plotted on the X-axis. Remember that the point of experiments is that, if a cause and effect relationship is found in a scientific study, then the outcomes can be manipulated or changed.

In our example experiment, learning that water turns to steam at a certain temperature is what can be useful. Once we hold the air pressure constant at sea level, then we know that if we need steam, we need to adjust or manipulate the temperature to degrees Fahrenheit. This, of course, is a very simple example just to illustrate the point of the cause and effect relationship and how we can manipulate it through changing dependent variables like temperature.

There are three main types of variables in a scientific experiment: Using these variables correctly helps scientists measure cause and effect in scientific experiments and allows scientists to manipulate cause and effect to produce desired outcomes. To unlock this lesson you must be a Study. Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

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Add to Add to Add to. Want to watch this again later? Variables in Science Lesson for Kids. Independent Variable Lesson for Kids: Physical Variables that Affect Internal Validity. What is a Constant in Science? Connecting the Steps of the Scientific Method. Developing a Scientific Hypothesis. What is a Responding Variable? What is an Independent Variable? Evaluating Data from Scientific Investigation. Interpreting Tables of Scientific Data: Drawing Logical Conclusions from Experimental Data. Hypothesis Lesson for Kids: Prentice Hall Earth Science: Holt McDougal Earth Science: ScienceFusion Matter and Energy: In this lesson, you will learn the definition of variables in science.

What Are Scientific Variables? Try it risk-free No obligation, cancel anytime. Want to learn more? Select a subject to preview related courses: Visual Representation of Scientific Variables Below is a line graph that shows where the data points would be shown for the dependent and independent variables in a study.

Cause and Effect Relationship and Manipulation Remember that the point of experiments is that, if a cause and effect relationship is found in a scientific study, then the outcomes can be manipulated or changed.

Learning Outcomes Subsequent to finishing this lesson on variables in science, it should be possible for you to: Unlock Your Education See for yourself why 30 million people use Study. Become a Member Already a member?

Earning College Credit Did you know… We have over college courses that prepare you to earn credit by exam that is accepted by over 1, colleges and universities.

To learn more, visit our Earning Credit Page Transferring credit to the school of your choice Not sure what college you want to attend yet? Browse Articles By Category Browse an area of study or degree level. Take a Picture of It! How to Become a Legal Administrator: Education and Career Roadmap. The independent variable should be limited to a single difference to eliminate crossover contamination.

The dependent variable is the observation being measured. It is dependent upon the independent variable. By reducing the independent variable to one, the dependent variable can be assumed to be caused by the one change. A scientist wants to determine if plants respond to music. A control group is constructed where the plants are not subjected to music. The soil, plant type, water, and sun exposure will all remain the same for every group. These are control variables. An experimental group will be given the independent variable of rock music.

A second experimental group will be given the independent variable of classic music. After a prescribed period, the plants will be measured for height. The plant height is the dependent variable because it depends on the conditions it was subject. The scientist can assume the differences, if any, are related to the music exposure. To truly verify the results, the experiment would be repeated. Repeating experiments is done to ensure the difference is not a fluke.

The independent variable is the one condition that is being changed in an experiment. The dependent variable changes as a result of the independent variable.

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Science Homework Help Independent Variable science homework help independent variable Welcome to /r/HomeworkHelp! Come here for homework help in most any field. [College Probability] .

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Feb 21,  · After searching through all the dependent and independent variables homework help that you get, you will learn that this might be one of the easiest sections in mathematics or statistics. In mathematics, an arbitrary input is known as the independent variable, while the arbitrary output is the dependent variable/5().