BA501CBA-NAU
Help start Syllabus Class Communicate Library

BA501 : The Class : POM : TQM : TQM- Home Work
SPC- Home Work

To complete this assignment successfully, you should:
  1. Study the assignment carefully.
  2. Use Excel to complete your assignments.
  3. Send the Excel file as an attachment through WebMail .

Production Operations Management

§ SPC Home Work §

Assignments

Send  to your instructor a single Excel file (including written answers) as e-mail an attachment through WebMail. addressed to BA501@mail.cba.nau.edu and put BA501 (last name) Assignment name and number somewhere in the e-mail "subject." If you have any questions on this home work, please e-mail me with questions.    Here is the Excel file for this assignment. 

Assignment – Statistical Process Control

 

1.      The overall average on a process you are attempting to monitor is 50 units.  The average range is 4 units.  What are the upper and lower control limits if you choose to use a sample size of 5?

 

2.      Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results. Develop appropriate control charts and determine whether there is any cause for concern in the cutting process.

 

 

Hour

R

 

1

3.25

0.71

 

2

3.10

1.18

 

3

3.22

1.43

 

4

3.39

1.26

 

5

3.07

1.17

 

6

2.86

0.32

 

7

3.05

0.53

 

8

2.65

1.13

 

9

3.02

0.71

 

10

2.85

1.33

 

11

2.83

1.17

 

12

2.97

0.40

 

13

3.11

0.85

 

14

2.83

1.31

 

15

3.12

1.06

 

16

2.84

0.50

 

17

2.86

1.43

 

18

2.74

1.29

 

19

3.41

1.61

 

20

2.89

1.09

 

21

2.65

1.08

 

22

3.28

0.46

 

23

2.94

1.58

24

2.64

1.97

3.      Daily samples of 100 power drills are removed from Drill Master’s assembly line and inspected for defects.  Over the past 21 days, the following information has been gathered.  Develop a 3 standard deviation (99.7% confidence) p-chart and graph the samples.  Is the process in control?

 

 

Day

Number of

Defective Drills

1

6

2

5

3

6

4

4

5

3

6

4

7

5

8

3

9

6

10

3

11

7

12

5

13

4

14

3

15

4

16

5

17

6

18

5

19

4

20

3

21

7

 

 

Once you have completed this assignment you should:

Go on to Statistical Process Control- Self Test Look here before beginning quiz if using a telephone modem.
or
Go back to Statistical Process Control: Activities and Assignments

Please reference "BA501 (your last name) Assignment name and number" in the subject line of either below.

E-mail Dr. Rakesh Pangasa at BA501@mail.cba.nau.edu
or call (928) 344-7588. Use WebMail for attachments.

Back to top

NAU

Copyright © 2002 Northern Arizona University
ALL RIGHTS RESERVED