Q7 - Median and range chart using median of subgroup medians A quality engineer collected process data for five subgroups with each subgroup consisting of two samples (n=2). The median and ranges of samples in each subgroup are summarized in Table 6 below. Table 6. Subgroup Data Subgroup 1 2 3 4 5 Median 12.97 12.95 13.02 13.00 13.01 Range 0.06 0.05 0.02 0.01 0.01 (7-1) Calculate the center line of median chart using median of subgroup medians. Answer Center line of median chart (7-2) Calculate the median of subgroup ranges, which is also the center line of range chart. Answer Average range R (7-3) Calculate the upper controllimit (UCL) and the lower controllimit (LCL) of median chart. Answer UCL of median chart LCL of median chart (7-4) Calculate the upper controllimit (UCL) and the lower control limit (LCL) of range chart. Answer UCL of range chart LCL of range chart Q7 - Median and range chart using median of subgroup medians A quality engineer collected process data for five subgroups with each subgroup consisting of two samples (n=2). The median and ranges of samples in each subgroup are summarized in Table 6 below. Table 6. Subgroup Data Subgroup 1 2 3 4 5 Median 12.97 12.95 13.02 13.00 13.01 Range 0.06 0.05 0.02 0.01 0.01 (7-1) Calculate the center line of median chart using median of subgroup medians. Answer Center line of median chart (7-2) Calculate the median of subgroup ranges, which is also the center line of range chart. Answer Average range R (7-3) Calculate the upper controllimit (UCL) and the lower controllimit (LCL) of median chart. Answer UCL of median chart LCL of median chart (7-4) Calculate the upper controllimit (UCL) and the lower control limit (LCL) of range chart. Answer UCL of range chart LCL of range chart