Q1 X and R chart

A quality engineer collected process data for 10 subgroups with each subgroup consisting of four samples (n=4). The averages and ranges of samples in each subgroup are summarized in Table 1 below.

Table 1. Subgroup Data

Subgroup	1	2	3	4	5	6	7	8	9	10
Average X	13.01	12.99	13.01	12.99	12.98	12.93	12.93	13.00	13.01	13.01
Range R	0.06	0.04	0.03	0.05	0.04	0.06	0.07	0.03	0.04	0.06

(1-4) Create X chart with center line, UCL, and LCL, and plot subgroup data in the below figure. Clearly label center line, UCL, and LCL.

(1-4) Create X chart with center line, UCL, and LCL, and plot subgroup data in the below figure. Clearly label center line, UCL, and LCL. (1-5) Answer questions in the below table on this process based on subgroup averages in P chart