Suppose that the sample regression line of the first-order model is 
.If we examine the relationship between y and x1 for three different values of x2,we observe that the effect of x1 on y remains the same no matter what the value of x2.
Definitions:
J1939 Data Bus
A communication protocol based on CAN (Controller Area Network) used primarily in heavy-duty vehicles for diagnostics and control of the vehicle systems.
Twisted Wire Pair
A type of cable where two conductors are twisted together to reduce electromagnetic interference, commonly used in telecommunication lines.
Multiplex Systems
Systems that combine multiple signals or data streams into one, improving efficiency in communications or electrical engineering applications.
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