Twenty samples of size six (6) were collected for a variable measurement. Determine the lower control limit and upper control limit for an R chart if the average range, R, is 4.4
a) LCL=0.3344, UCL= 9.3016
b) LCL= 0.0000, UCL = 1.4696
c) LCL= 1.826, UCL = 6.974
d) LCL=0.0000, UCL = 8.8176
e) LCL=0.0000, UCL = 176.3520