According to your text,variables,by definition,can:
A) have no operational definition.
B) be changed or evaluated.
C) involve random assignment.
D) be constants.

Question

Quizplus · Accepted Answer

The definition of a variable is that it is something that can be changed, manipulated, or evaluated within an experiment or study. Variables should have an operational definition, and they may or may not involve random assignment. Variables are not constants, as they are expected to change or vary in some way. Therefore, the best choice is B.

According to Your Text,variables,by Definition,can