3.. Consider the number of standard deviations used to calculate the upper and l

Question

3.. Consider the number of standard deviations used to calculate the upper and lower control limits for a control chart (i.e. z-3 on each side of the mean vs. z -6 on each side of the mean). We would need to: A. decrease the standard deviation in order to move from three sigma quality to six sigma quality. B. increase the standard deviation in order to move from three sigma quality to six sigma quality C. decrease the mean in order to move from three sigma quality to six sigma quality. D. adjust the tolerances in order to move from three sigma quality to six sigma quality 4.A process is generally considered to be in control when: A. most of the sample points are close to the center line without trending toward the control limits. B. All of the answers are true concerning an in control process. C. the sample points are randomly distributed with about the same number above the center line as below. D. there are no sample points outside of the control

Explanation / Answer

3. A: z=(x-u)/std dev. and Probability= normsdist(z); We need to decrease Standard Deviation to move from 3 sigma to 6 sigma.

4. B. All options are true.

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