Suppose you are producing a product implementing statistical process control
a. Give an example of assignable variation that would create a level shift.
b. Give an example of assignable variation that would create instability.
c. Give an example of assignable variation that would create a trend.
d. Give an example of assignable variation that would create a cycle.
a. Machine breakdown, new machine and/or operator, or a change in environment, such as temperature or humidity can create a level shift.
b. A machine in need of repair, defective materials, wear of tools, or a poorly trained operator can cause instability.
c. Less than regular maintenance, including operator fatigue, residue or dirt buildup, a gradual loss of lubricant in a machine can cause a trend.
d. Cyclical chances in environment (for example night vs. day temperature) or a change in operators every 8 hours can cause cyclic variation.
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