which is the symbol used to
represent the grand mean. The grand mean is
the mean of all the subgroup means. It is calculated by adding up all
of the subgroup means, and then dividing by the number of subgroups.We are now ready to begin the control limit calculations. If you look
at your calculation sheet, you will see that the first calculation is
for the value which is the symbol used to
represent the grand mean. The grand mean is
the mean of all the subgroup means. It is calculated by adding up all
of the subgroup means, and then dividing by the number of subgroups.
Using the data from your printed chart, work out the sum of the subgroup means and enter this value in the box highlighted in red below. When you have done this, click the button to check your answer.