Description
The data in the table below lists country code and the order to remittance (OTR) time for hardware / software installations for the last 76 installations (from first to last). OTR is the time it takes from an order being placed until the system is installed and payment is received (remittance). Because this company does business internationally, it also notes the country of installation using a country code. This code is listed in the first column.
Use the date in table above and answer the following questions in the space provided below:
- Does the OTR time appear to be stable? Why or why not?
- If you were to use a control chart to evaluate stability, which chart would you use? Why?
- What can you learn about the distribution of the installation process?
- Does it appear that the country has an impact on installation time? Why or why not?
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Explanation & Answer
hi, PFA.......There are certain mistakes in control chart of the solution you sent, detailed calculation is done in excel.....The summary report is obtained from minitab, i have also shown its calculations in excel till 95% confidence interval for mean (also included minitab report)......Let me know if you need assistance for downloading minitab.
Country code
1
1
1
1
14
1
1
17
1
1
6
5
5
1
1
7
7
1
17
7
1
8
17
8
7
8
6
6
5
7
5
6
6
1
7
1
1
1
5
6
7
8
5
OTR cycle time
mean
20
24
46
26
38
15
15
23
31
31
64
29
44
32
15
11
14
89
41
41
36
43
21
28
18
47
26
...