Describe the term “process in control.”
What will be an ideal response?
In any process that is operating within design specifications a natural pattern of variation exist. Identical processes will have unique characteristics that when carefully studied will still show signs of natural variation. This natural pattern of variation is illustrated in Figure 6-1. In theexample below about 40% (6 points) of the points fall between one plus or minus one standard deviation. On the same example about 47% (7 points) of the plotted points fall inside the two standard deviations and only 13% (2 points) of the plotted points fall in the third standard deviation. The variation in this example the 15 plotted points move back and forth across the target specifications. This natural pattern forms it’s own frequency distribution. Figure 6-1 illustrates how data points can be plotted into a normal curve.
You might also like to view...
Which of the following is used to define the tool length:
A. G-codes B. M-codes C. T-codes D. H-codes E. D-codes
The surface finish for the cylinder walls usually depends on ________
A) The cylinder wall-to-piston clearance B) The type of engine oil that is going to be used in the engine C) The type of piston rings to be used D) Both B and C
Which of these is true about an alternator with an overrunning pulley?
A) It can use a conventional replacement pulley. B) Replacement pulley must be the overrunning type. C) Both A and B D) Neither A nor B
Which of the following may contribute to detonation?
A. A lean air/fuel ratio B. A rich air/fuel ratio C. A malfunctioning EGR system D. Both A and C