Question: 2 . 2 When sigma is known, the 3 - sigma control limits for an R chart can be given by UCL = (

2.2 When \sigma is known, the 3-sigma control limits for an R chart can be given by
UCL=(d_2+3d_3)\sigma
CL=d_2\sigma
LCL=(d_2-3d_3)\sigma
Using the data in the above table to determine \sigma , find the control limits for an R chart in this way. Compare with the limits calculated in 2.1 and comment.

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