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Andrey
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Предмет:
Файл:(EOD).Quality control.pdf
page 50
c) A set of samples are taken from a process in one instant in time. The samples are all from a very short period of production time.
d)
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trends of downward points
too many points between +2 and +3 σ
8.May as well use a3 and a4, but other methods could be used. X = 148.3125, s = 9.0459, a3 =
.3900 (skewed to right, positive direction), a4 = 1.958 indicates mesokurtic.
9.
154.26 |
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148.31
X
142.36 |
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41.94 |
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22.75
R
3.56 |
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4.11 QUALITY CONTROL FORMS
1. Frequency Distribution Analysis Sheet
page 51