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Four Types of Variables That is the reason why the terms "nominal", "ordinal", "interval", and "ratio" are often referred to as levels of measure.
1:21 3:41 Variables in Science: Independent, Dependent and Controlled! YouTube Start of suggested clip End of suggested clip Three controlled variables these variables are all the things that you keep constant in yourMoreThree controlled variables these variables are all the things that you keep constant in your experiment. So in our squid experiment.
An experiment usually has three kinds of variables: independent, dependent, and controlled.
A control variable is an element that is not changed throughout an experiment because its unchanging state allows the relationship between the other variables being tested to be better understood.
Essentially, a control variable is what is kept the same throughout the experiment, and it is not of primary concern in the experimental outcome. Any change in a control variable in an experiment would invalidate the correlation of dependent variables (DV) to the independent variable (IV), thus skewing the results.

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What is a control variable? A control variable is any variable that's held constant in a research study. It's not a variable of interest in the study, but it's controlled because it could influence the outcomes.
1:21 3:41 Variables in Science: Independent, Dependent and Controlled! YouTube Start of suggested clip End of suggested clip Three controlled variables these variables are all the things that you keep constant in yourMoreThree controlled variables these variables are all the things that you keep constant in your experiment. So in our squid experiment.
Examples of common control variables include: Duration of the experiment. Size and composition of containers. Temperature. Humidity. Sample volume. Pressure. Experimental technique. Chemical purity or manufacturer.
These types are briefly outlined in this section. Categorical variables. A categorical variable (also called qualitative variable) refers to a characteristic that can't be quantifiable. ... Nominal variables. ... Ordinal variables. ... Numeric variables. ... Continuous variables. ... Discrete variables.
1:21 3:41 Variables in Science: Independent, Dependent and Controlled! YouTube Start of suggested clip End of suggested clip Three controlled variables these variables are all the things that you keep constant in yourMoreThree controlled variables these variables are all the things that you keep constant in your experiment. So in our squid experiment.

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