We assume the population SD in each group is 400g and the total sample size is 100. Table 1 below shows that if the groups are of equal size (a 1:1 ratio), then the power is 0.87. The study has an 87% ...

and R Charts with Varying Subgroup Sample Sizes Note that the central line on the R chart and the control limits on both charts vary with the subgroup sample size. The sample size legend in the lower ...