MAN 3504 - Statistical Quality Control (6 slides per page)

MAN 3504 - Statistical Quality Control (6 slides per page)...

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MAN 3504 - Statistical Quality Control 1 1 MAN 3504: Statistical Quality Control Statistical Quality Control MAN 3504: Statistical Quality Control Statistical Quality Control Overview ± Quality? ± Quality Control? ± Statistical Quality Control? ± Why Statistics? ± Why Samples? MAN 3504: Statistical Quality Control Inspection Types ± By Attributes Each unit “good” or “bad (defective)” Relatively easy/quick Lower training Can combine many quality checks into one decision ± By Variables Each unit specifically measured Detailed information, many statistics can be computed Cannot combine quality checks MAN 3504: Statistical Quality Control Categories of SQC ± Acceptance Sampling Taking a sample from a large batch of product that has already been processed , and either accepting or rejecting the entire batch based on the findings from the sample ± Process Control (SPC) Taking many relatively small samples from the production process as it is being performed , so that problems can be addressed before they result in a lot of bad product MAN 3504: Statistical Quality Control SPC Control Chart Overview ± SPC involves doing a series of hypothesis tests about our production process H 0 : Process is operating normally (“in control”); that is, within it’s typical or natural bounds of variations (i.e. with only random fluctuations ) H 1 : Process is not operating normally (“out of control”); that is, an extraneous or assignable source of variation” (i.e. a problem) is present (i.e. operating with non-random fluctuation) ± Process control charts are simply a means to keep up with, and easily perform, these hypothesis tests MAN 3504: Statistical Quality Control SPC Control Chart Overview ± Virtually every control chart is built on assumption that the thing being plotted on the
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MAN 3504 - Statistical Quality Control (6 slides per page)...

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