What isThe difference between multiple independent variables

What isThe difference between multiple independent variables and multiple levels of independent variables are that multiple independent variables

Solution

The independent variables can be of different types, and these different types can be
present in the same study. Qualitative independent variables describe different
kinds of treatments.

Independent variables cannot be manipulated by the researcher. If more than one independent variable is
examined, the independent variables may interact in such a way that the effect of one
or more variables depends upon the levels of one or more dependent variables