How is a manipulated variable different from a controlled variable?
A. When a manipulated variable changes, it causes the controlled
variable to change.
B. When a controlled variable changes, it causes the manipulated
variable to change.
C. A manipulated variable is a factor that must remain constant, but
a controlled variable is one that can change.
D. A manipulated variable is a factor that is changed, but a controlled
variable must remain constant.
