MAT 510 Strayer University Moving Range Control Chart Questions

To complete this assignment, you need to create a Control Chart for each country code. With the Control Chart, you will need to identify if the data collected on each country code presents special cause variation.

The following table lists country code and the order to remittance (OTR) time for a firm’s software installations for the last

7

6

installations (from first to last). OTR is the time it takes after an order is received 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.

Country Code

and OTR

for Software Systems Installation

Country Code

Cycle Time

1

2

9

1

40

1

15

7

1

19

14

24

1

81

1

53

17

26

1

28

1

34

6

34

5

50

5

52

1

19

1

44

7

150

7

29

1

23

17

79

7

13

1

32

8

61

17

42

8

46

7

88

8

24

6

7

6

33

5

129

7

41

5

43

6

42

6

42

1

53

7

53

1

48

1

21

19

Cycle Time
Cycle Time	Country Code
20	5
24	6
46	7
26	8
38	5
15	1
15	7
23	7
31	1
31	1
64	1
29	7
44	1
32	1
15	1
11	14
14	7
89	17
41	6
41	17
36	6
43	7
21	8
28	8
18	7
47	14
26	7
47	1
9	5
42	17
5	17
27	14
27	14
33	7
44	7
21	7
22	5
1	50	1

Using the data in the table above, answer the following questions in a Word document and submit:

1. Does the OTR time appear to be stable? Why or why not?
2. If you were to use a control chart to evaluate stability, which chart would you use? Why?
3. What can you learn about the distribution of the installation process?
4. Does it appear that the country has an impact on installation time? Why or why not?

To complete this assignment, you need to create a Control Chart for each
country code. With the Control Chart, you will need to identify if the data
collected on each country code presents special cause variation. Watch the
video in the class media gallery to learn about how to construct control
charts.
Homework
The following table lists country code and the order to remittance (OTR) time for a firm’s software
installations for the last 76 installations (from first to last). OTR is the time it takes after an order is received
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.

Country Code and OTR Cycle Time for Software Systems Installation

Country Code
Cycle Time
Country Code
Cycle Time
1
20
5
29
1
24
6
40
1
46
7
157
1
26
8
19
14
38
5
24
1
15
1
81
1
15
7
53
17
23
7
26
1
31
1
28
1
31
1
34
6
64
1
34
5
29
7
50
5
44
1
52
1
32
1
19
1
15
1
44
Country Code and OTR Cycle Time for Software Systems Installation
Country Code
Cycle Time
Country Code
Cycle Time
7
11
14
150
7
14
7
29
1
89
17
23
17
41
6
79
7
41
17
13
1
36
6
32
8
43
7
61
17
21
8
42
8
28
8
46
7
18
7
88
8
47
14
24
6
26
7
7
6
47
1
33
5
9
5
129
7
42
17
41
5
5
17
43
6
27
14
42
6
27
14
42
1
33
7
53
7
44
7
53
1
21
7
48
1
22
5
21
1
50
1
19
Using the data in the table above, answer the following questions in a Word document and submit:
1.
2.
3.
4.
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?
Week

6

Assignment
Moving Range Control Chart
MAT 510
Steps to start the analysis
• The purpose of this
assignment is to create
moving range control charts
to determine process
stability.
• Identification of special
cause variation using the
information provided in
figure 5.36
Identifying Outliers for Special Cause Variation in a MR Control Chart
Moving Range Control Charts
Review pages 205 -213 “PROCESS
STABILITY AND CAPABILITY TOOLS.”
• Moving Range Control Charts are used to analyze the variability
between two consecutive points.
• The sample size “n” = 2
• For consecutive numbers we cannot calculate the standard deviation
for such small size; instead, we use an alternate method to measure
variation by calculating the moving range average.
• Due to this variation, we use a factor d 2 = 2.66 as or sigma value.
Creating Excel Worksheet for your MR control
Charts
Copy
Copy-paste the
data provided into
an Excel worksheet
Organize
Organize your data
from lowest to
highest
Create
Analyze
Create a control
chart for each
country code
Analyze each
control chart for
special cause
variation
Calculations
Formulas to Enter
1
Calculate the
average of the cycle
time data
2
Calculate the
Moving Range
3
Calculate the
Moving Range
Average
4
Calculate the Lower
Limit and the Upper
Limit using the
following formula