Month	Number of Claims	Total Coding Errors	Errors/ Claim	Code A Error	Code B Error	Code C Error	Code D Error	Code E Error	Code F Error	Code G Error	Code H Error	Code I Error
1	716	868	1.21	79	98	227	189	198	26	17	26	8
2	850	936	1.10	91	62	295	211	205	28	2	21	21
3	1028	1090	1.06	155	109	307	298	152	9	5	40	15
4	790	1012	1.28	149	118	284	207	198	18	16	15	7
5	768	807	1.05	162	85	158	154	157	52	7	32	0
6	990	708	0.72	45	84	167	168	173	32	14	18	7
7	872	844	0.97	93	86	195	173	201	31	28	19	18
8	904	666	0.74	87	92	121	201	115	16	26	5	3
9	1038	646	0.62	59	75	165	165	98	19	37	24	4
10	1202	569	0.47	100	61	135	147	58	24	15	18	11
11	1096	612	0.56	118	59	98	219	43	28	21	11	15
12	978	625	0.64	92	110	117	206	58	19	14	9	0
13	1300	563	0.43	68	106	63	217	65	11	9	23	1
14	1052	429	0.41	77	57	52	169	25	8	7	26	8
15	788	605	0.77	103	81	46	243	61	17	21	24	9
				248	244	161	629	151	36	37	73	18

This question refers to the "Claims Processing" case. A hospital processes claims and the insurance companies often reject them for coding errors. A process improvement team has been working on a project to reduce coding errors for the past 15 months and the data for the number and type of coding errors can be downloaded from the link provided. Use this data to answer the question below. The team implemented several solutions that took effect after month 4. Use an appropriate control chart to assess process behavior over the 15 month time span. Is there evidence of an improvement? The data indicate that the process is stable over the 15 month time period and that the improvement actions were effective. The process varies, but is statistically stable; observed improvements are due to common cause variation, so there is no true improvement. The process is unstable over the 15 month timeframe, and there is no discernible trend in the number of coding errors. There is an apparent improvement trend, but the sample size is too small to draw any meaningful conclusions. The process is unstable over the 15 months, and displays a downward shift in the average errors/claims, indicating a favorable shift