Design of Experiments and Statistical Process Control - Fundamentals of Industrial Chemistry: Pharmaceuticals, Polymers, and Business - page 237

about what the change may have been and take actions to prevent its reoccur-
rence. This enables continuous process improvement.

QUESTIONS

…

1. (Mark each of a-d as True or False) Design of Experiments

a. can prevent confusion of correlation with causation
b. can prevent confusion due to experimental error
c. is more efficient than application of scientific principles
d. cannot be used if there are interacting variables
2. Examine the process data below. The data is listed sequentially and repre-
sents 20 samples taken every eight hours and the resultant specific gravity
results.
0.71, 0.69, 0.72, 0.69, 0.69, 0.71, 0.71, 0.69, 0.76, 0.76, 0.77, 0.76, 0.77,
0.78, 0.76, 0.77, 0.69, 0.69, 0.70, 0.69
Which is true?
a. The process is “in-control”
b. The process is “out of control”
c. We do not know if the process is in control because the problem does
not tell us the process limits.
d. We do not know if the process is in control because the problem does
not tell us the type of synthesis.
3. Explain your selection for problem 2.

REFERENCE

1. Rick Mullin. Chemical and Engineering News 2013; 91(13):27.