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d. An entity that takes on different values is: a variable.
More about the variable:
Anything that has the potential to change is a variable. Age, for instance, might be seen as a variable because it can have different meanings for many individuals or for the same individual at various times. Similar to that, a person's nationality can be a variable because a value can be set to it.
Significant difference The distinction between an independent and dependent variable has to do with the word "variable." When examining cause-and-effect linkages, this distinction is especially important. I took the longest to understand this difference.
Two characteristics of variables, to sum up, should always be attained. The attributes of a variable should be mutually exclusive, meaning that no respondent should be able to have two attributes at the same time. Each variable should be exhaustive, meaning that it should include all conceivable answered responses.
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