Dent Mfg. has collected thirty samples of 6 items from their manufacturing process in order to construct control charts. The average of the sample means for the diameter of the drilled hole is 9.2mm and the average sample range is 1.8mm.
You will also need to refer to the control chart factor table
A: Calculate the upper control limit for the X bar chart.
B: Calculate the lower control limit for the X bar chart. State your answer to two decimal places.
C: Calculate the upper control limit for the range chart. State your answer to two decimal places.
D: Calculate the lower control limit for the R chart. State your answer to two decimal places.