As a quality control engineer, you have taken the task to sample 6 lightbulbs every day for the next 21 days and checking the wattage performance of the product produced to look into the process pattern. Show your steps in coming up with a control chart for this sampling. Do you have any comment on the process based from your control chart?

Day	Wattage of 6 samples
1	105.6	93.8	98.8	102.5	100.5	95.6
2	95.6	98.6	102.9	105.4	106.8	109.1
3	94.4	93.2	95.1	98.8	101.5	93.3
4	102.5	100.2	98.6	99.3	99.9	96.4
5	100.5	105.6	101.7	103.8	106.1	102.2
6	101.2	96.5	95.3	99.6	91.1	92.5
7	94.2	99.3	96.4	99.7	102.5	103.7
8	98.5	102.3	104.8	101.2	107.9	103.5
9	101.5	102.5	99.8	107.6	108.9	101.6
10	92.2	96.8	99.8	91.2	90.3	97.6
11	96.5	91.6	95.5	96.6	105.6	95.7
12	100.2	108.3	102.5	92.3	94.6	107.5
13	115.3	108.6	106.3	109.6	110.5	111.5
14	91.5	100.5	96.3	99.7	98.3	99.4
15	102.3	99.9	98.7	92.5	103.5	100.2
16	99.2	91.2	92.5	89.6	97.0	95.4
17	88.6	94.3	87.4	99.5	92.2	90.6
18	95.5	94.4	92.5	99.6	91.3	100.5
19	92.3	90.8	95.6	91.4	92.5	95.6
20	102.5	107.5	109.3	92.5	96.3	91.6
21	105.3	94.7	107.6	108.3	92.3	109.6