Sometimes.
There need not be any independent variable - if the variables are all intercorrelated through feedback.
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Independent variables can take values within a given boundary. The dependent variable will take values based on the independent variable and a given relationship at which the former can take its values.
The independent variable is whether they take the multivitamin or not. The dependent variable is how it affects their health, or whatever you are researching.The independent variable is whether they take the multivitamin or not. The dependent variable is how it affects their health, or whatever you are researching.The independent variable is whether they take the multivitamin or not. The dependent variable is how it affects their health, or whatever you are researching.The independent variable is whether they take the multivitamin or not. The dependent variable is how it affects their health, or whatever you are researching.
A variable is a measurement that can take different "values". I put values in quotation marks because a variable can take qualitative values (for example, colour of eye) as well as quantitative (numerical) ones.
It can be but not always. The experimenter may just have to take the independent variable as it happens.
A "variable" is something that can take different values.