Chart Preparation Excercise (6)

Having calculated the grand mean, which will be the centre line on the graph, we now need to calculate the mean range which will be the centre line on the R graph.

The calculation is very similar to that for the grand mean. To begin with, you need to calculate the sum of all the subgroup ranges. Enter this value into the box outlined in red below, and click the button to check your answer.

SUM No. of Subgroups ÷ =   SUM R No. of Subgroups ÷ =