1. Which of the following regarding linear regression is correct?
A. Linear regression is a form of exponential smoothing.
B. Linear regression is the most commonly used qualitative method.
C. Linear regression requires use of an independent variable to make estimates.
D. None of the above are correct.
2. Which statement best represents the key assumption(s) of process control?
A. Most processes are affected by common and special causes of variation.
B. It is easier to address common cause variation than special cause variation.
C. Most processes are found to be in control.
D. All of the above.