cannot function as a calling and texting mechanism
mechanism
therefore it is now defective so that's
the difference between defective item
and defects per unit now let's put this
control chart selection in a simpler
form I have here prepared two tables if
your data is continuous that is anything
that can be measured you will check your
sample size on the Left column match it
with this categories and you can now
identify whether it will fall in an
individual X moving range chart or in an
X bar and our chart or in an X bar and s
sharp that's simple if your data now is
an attribute data anything that will be
counted from categories you have to ask
yourself two questions first what are
you counting if you are counting
defective items coming from the samples
the next question would be is your
sample size fix meaning for every time
that you take samples the sample size
does not change let's say every day you
have to take five samples then it's a
fixed sample size if that's the case you
will have to use NP choice on the other
hand if you are counting defective items
from samples that you are doing coming
from the production or service facility
and the sample size is variable or a chain
chain
just from time to time let's say day to
day you cannot use any chart anymore but
rather you have to use what we call a
chart these are the two charts that you
use when you're counting the effective items
items
now let's say you're counting defects
per unit the next question will be is
your sample size fix if yes then you
have to use what we call a seat sir and
if your sample size is variable for
varying you have to use what we call
future this is a simplified version of
how you can use control chart in order
for you to have better results in
managing and monitoring your process
output in terms of the variation
remember that in your controls control
plan you can use control chart for you
to be able to monitor its performance as
against the required or necessary amount
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