Statistical Quality Control By Mahajan.pdf -

To monitor the central tendency (mean) and dispersion (range) of a process when quality characteristics are measurable, e.g., length, weight, diameter, hardness.

[ UCL_R = D_4 \barR, \quad CL_R = \barR, \quad LCL_R = D_3 \barR ] (A₂, D₃, D₄ are factors depending on n, given in standard tables.) Statistical Quality Control By Mahajan.pdf

If you are interested in downloading the PDF version of "Statistical Quality Control" by Mahajan, you can search for it online. However, be sure to only download from reputable sources to ensure that you get a high-quality version of the book. To monitor the central tendency (mean) and dispersion