# MGT655 Week 7 chapter 12 and 13 questions

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MGT655 Week 7 chapter 12 and 13 tutorial in excel

Chapter 12

7. The following table lists all costs of quality incurred by Sam’s Surf Shop last year. What was Sam’s appraisal cost for quality last year?

Annual inspection costs $ 155,000

Annual cost of scrap materials 286,000

Annual rework cost 34,679

Annual cost of quality training 456,000

Annual warranty cost 1,546,000

Annual testing cost 543,000

Annual inspection costs $ 155,000

Annual cost of scrap materials 286,000

Annual rework cost 34,679

Annual cost of quality training 456,000

Annual warranty cost 1,546,000

Annual testing cost 543,000

10. A manufacturing company has been inspecting units of output from a process. Each product inspected is evaluated on five criteria. If the unit does not meet standards for the criteria it counts as a defect for the unit. Each unit could have as few as zero defects, and as many as five. After inspecting 2,000 units, they discovered 33 defects. What is the DPMO measure for this process?

Chapter 13, Objective Questions:

6. C-Spec, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of 4 6 .003 inches. After a trial run on this machine, C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch.

a. Calculate the Cpk for this machine.

b. Should C-Spec use this machine to produce this part? Why?

a. Calculate the Cpk for this machine.

b. Should C-Spec use this machine to produce this part? Why?

7. Ten samples of 15 parts each were taken from an ongoing process to establish a p-chart for control. The samples and the number of defectives in each are shown in the following

table:

Sample n

Number of

Defective Items

in the Sample Sample n

Number of

Defective Items

in the Sample

1

2

3

4

5

15

15

15

15

15

3

1

0

0

0

6

7

8

9

10

15

15

15

15

15

2

0

3

1

0

a. Develop a p-chart for 95 percent confi dence (1.96 standard deviation).

b. Based on the plotted data points, what comments can you make?

table:

Sample n

Number of

Defective Items

in the Sample Sample n

Number of

Defective Items

in the Sample

1

2

3

4

5

15

15

15

15

15

3

1

0

0

0

6

7

8

9

10

15

15

15

15

15

2

0

3

1

0

a. Develop a p-chart for 95 percent confi dence (1.96 standard deviation).

b. Based on the plotted data points, what comments can you make?

8. A shirt manufacturer buys cloth by the 100-yard roll from a supplier. For setting up a control chart to manage the irregularities (e.g., loose threads and tears), the following data were collected from a sample provided by the supplier.

Sample 1 2 3 4 5 6 7 8 9 1 0

Irregularities 3 5 2 6 5 4 6 3 4 5

a. Using these data, set up a c-chart with z 5 2.

b. Suppose the next fi ve rolls from the supplier had three, two, fi ve, three, and seven irregularities. Is the supplier process under control?

Sample 1 2 3 4 5 6 7 8 9 1 0

Irregularities 3 5 2 6 5 4 6 3 4 5

a. Using these data, set up a c-chart with z 5 2.

b. Suppose the next fi ve rolls from the supplier had three, two, fi ve, three, and seven irregularities. Is the supplier process under control?

9. Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows:

Sample Number Readings (in ohms)

1

2

3

4

5

6

7

8

9

10

1010

995

990

1015

1013

994

989

1001

1006

992

991

996

1003

1020

1019

1001

992

986

989

1007

985

1009

1015

1009

1005

994

982

996

1005

1006

986

994

1008

998

993

1005

1020

996

1007

979

11

12

13

14

15

996

1019

981

999

1013

1006

996

991

993

1002

997

991

989

988

1005

989

1011

1003

984

992

Sample Number Readings (in ohms)

1

2

3

4

5

6

7

8

9

10

1010

995

990

1015

1013

994

989

1001

1006

992

991

996

1003

1020

1019

1001

992

986

989

1007

985

1009

1015

1009

1005

994

982

996

1005

1006

986

994

1008

998

993

1005

1020

996

1007

979

11

12

13

14

15

996

1019

981

999

1013

1006

996

991

993

1002

997

991

989

988

1005

989

1011

1003

984

992

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