Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last four samples are shown in the table. Create control charts that will fully monitor the process and indicate the result of X-bar and R chart analysis.

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