Question

to look at 36 weeks instead of 20 weeks. His quality improvement team provided him with the data below after an “intervention” was introduced in week 20. Calculate the upper and lower control limits and then construct a control chart. Display your chart. Question: Using the rules for detecting special causes, can you detect any special causes in this case? If so, what special causes can you detect? What does this mean? Was the intervention successful in reducing the delays?

Week	Average Delay Time (in days)
1	34
2	30
3	35
4	32
5	28
6	26
7	29
8	28
9	35
10	26
11	34
12	31
13	28
14	40
15	26
16	32
17	31
18	30
19	33
20	35
21	26
22	19
23	21
24	23
25	25
26	17
27	21
28	22
29	21
30	17
31	23
32	22
33	24
34	19
35	20
36	21

Answer 1

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