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That's the independent variable.
It can depend on nothing or on an variable which is outside of the scope of the study.
An independent variable is the factor that is manipulated by the experimenter in an effort to study the effects of the change upon the dependent variable.
The answer depends on the context of the study.
A dependent variable is usually on the side of the equation by itself. The independent variable usually has something being done to it. And, the dependent variable is usually written to the left of the equation.
variable
Anxiety would be the experimental variable
The independent variable is the thing you are changing. The dependent variable is the result you are trying to measure. In a caffeine study, the amount of caffeine given to a subject would probably be the independent variable. The dependent variable would be what you are measuring, like moodiness, apparent energy, kidney function, etc.
A variable
Yes. If you are conducting a study, and collecting data, the number of cars would be a discrete variable.
extraneous variable
That's the independent variable.
It may or may not be: it depends on the study. In a study of how people intend to vote in an election, the political affiliation would be an independent variable - although probably very highly correlated with the voting intention. On the other hand in the study of the political affiliation of the people who voted in favour of (or against) a particular person, it will be a dependent variable.
dependent variable
amount of moisture!
It can depend on nothing or on an variable which is outside of the scope of the study.
When a variable is directly influenced by another variable it is known as a dependent variable. Conversely, a variable that isn't directly affected by another variable is known as a independent variable.