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C4. Test for Special Causes of Variation | Ask Lex PH Academy | YouTubeToText
YouTube Transcript: C4. Test for Special Causes of Variation
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Video Transcript
hi welcome back in this section we will
explore a little deeper what is the test
for special causes as mentioned
naturally speaking he process output has
a random very shoddy embedded on it
therefore there is common causes of
variation that is always present but
there are cases that there are presence
of what we call special causes this are
causes that cost
the points to fall beyond or below the
control limits signaling a problem
inside your process now we have eight
tests for special causes of variation
when we say special costs of very short
these are about patterns what we studied
about analyze phase we have trend cycles
and shift one of the most used special
causes for aberration test is what we
call test one for any points Beyond or
below the plus three minus three
standard deviation from the center line
test two to test eight talks about the
different patterns that we can see
inside a control chart you don't have to
memorize this special costs very short
but we just want you to understand that
on top of the usual rule test one there
are other ways on how to detect special
causes of variation in order for us to
see patterns and in order for us to
predict whether there will be a problem
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