Answer:
The independent variable is one that is controlled to corroborate its effects or the relationship causes consequence with a phenomenon in relation to the dependent variable.
Explanation:
In an epidemiological study, or a research based on a hypothesis, there are different variables.
Variables are those phenomena that vary over time and can be quantifiable over time.
The quantification of the variables must be through indexes or analysis, and these in turn must confer data reliability.
On the other hand, there are two types of variables, dependent and independent, homogeneous or non-homogeneous (that is, they occur in one individual or in many at the same time) and if they are reasonable or not in the face of a given investigation.
If the variable that is chosen in an investigation is not reasonable or homogeneous, it will never become independent or dependent since it will not be good to take it into account or count it during the investigation.
In this case, the possible variables could be: the type of music, different levels of hearing by the workers, the type of work they do when listening to music, the volume of the music in which it is heard.
