÷ d2,
where d2 is another control chart constant whose value depends on the size
of the subgroups used.The formula for calculating 1 sigma unit for the individual values is
÷ d2,
where d2 is another control chart constant whose value depends on the size
of the subgroups used.
The appropriate value of d2 for use with subgroups
of size 5 is 2.326, as you can see from the bottom left hand section of
your calculation sheet. This value, along with the value for
which you calculated in the previous exercise, has been entered onto the
sheet below for you. Complete the calculation for 1 sigma, and enter it into
the first box outlined in red, then multiply it by 6 and enter this value of
6 sigma in the second outlined box. Both of your answers should be rounded to
3 decimal places. When you have done this, click the button to check your
answers.