The answer depends on whether or not you (or someone else) have any control over it. If someone has control then they can choose the values. If not, you get what the observations give you.
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You choose the values of the independent variable. The dependent variable is the one you measure.
Measure them!
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 usually assigned to x the dependent variable is usually assigned to y their values will vary because they are variables. that is the definition of variable
An independent variable can be any of a given set of values while a dependent variable is represented as a function of another variable.