Construct a 3-sigma and R-chart for the length in centimeters of a part from the following table and Control Chart. Do you think the process is under control, why?

Table 1.

Sample #	Observation 1	Observation 2	Observation 3	Observation 4
1	0.486	0.499	0.493	0.511
2	0.499	0.506	0.516	0.494
3	0.496	0.5	0.515	0.488
4	0.495	0.506	0.483	0.487
5	0.472	0.502	0.526	0.469
6	0.473	0.495	0.507	0.493
7	0.495	0.512	0.49	0.471
8	0.525	0.501	0.498	0.474
9	0.497	0.501	0.517	0.506
10	0.495	0.505	0.516	0.511

Control Charts for Variables (3 of 6) Table 3.1 Factors for Calculating Three Sigma Limits for the x -Chart and R-Chart Size of Factor for UCL and LCL Factor for LCL for Factor for UCL for Sample (n) for X-Chart (A2) R-Chart (D3) R-Chart (D4) 2 1.880 0 3.267 3 1.023 0 2.575 4 0.729 O 2.282 5 0.577 2. 115 O O 6 0.483 2.004 0.419 0.076 1.924 0.373 0. 136 1.864 9 0.337 0. 184 1.816 10 0.308 0.223 1.777