Operations Management
Homework

Problem 1:

You are the newly appointed
assistant administrator at a local hospital and your first project is to
investigate the quality of the patient meals put out by the food-service
department. You conducted a 10-day survey by submitting a simple questionnaire
to the 400 patients with each meal, asking that they simply check off that the
meal was either satisfactory or unsatisfactory. For simplicity in this problem,
assume that the response was 1,000 returned questionnaire from the 1,200 meals
each day. The results are as follows:

NUMBER OF UNSATISFACTORY MEALS

SAMPLE SIZE

December
1

74

1,000

December 2

42

1,000

December 3

64

1,000

December 4

80

1,000

December 5

40

1,000

December 6

50

1,000

December 7

65

1,000

December 8

70

1,000

December 9

40

1,000

December 10

75

1,000

600

10,000

Construct
a p chart based on the
questionnaire results, using two standard deviations.
What
comments can you make about the results of the survey?

Problem 2:

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 sample information with mean and range is listed as follows:

Sample

1

2

3

4

mean

range

1

1010

991

985

986

993.00

25

2

995

996

1009

994

998.50

15

3

990

1003

1015

1008

1004.00

25

4

1015

1020

1009

998

1010.50

22

5

1013

1019

1005

993

1007.50

26

6

994

1001

994

1005

998.50

11

7

989

992

982

1020

995.75

38

8

1001

986

996

996

994.75

15

9

1006

989

1005

1007

1001.75

18

10

992

1007

1006

979

996.00

28

11

996

1006

997

989

997.00

17

12

1019

996

991

1011

1004.25

28

13

981

991

989

1003

991.00

22

14

999

993

988

984

991.00

15

15

1013

1002

1005

992

1003.00

21

Develop an .gif”> chart and an R chart and plot the values. From the
charts, what comments can you make about the process?

Operations ManagementHomework Problem 1:You are the newly appointed
assistant administrator at a local hospital and your first project is to
investigate the quality of the patient meals put out by the food-service
department. You conducted a 10-day survey by submitting a simple questionnaire
to the 400 patients with each meal, asking that they simply check off that the
meal was either satisfactory or unsatisfactory. For simplicity in this problem,
assume that the response was 1,000 returned questionnaire from the 1,200 meals
each day. The results are as follows:NUMBER OF UNSATISFACTORY MEALSSAMPLE SIZEDecember
1 74 1,000December 2421,000December 3641,000December 4801,000December 5401,000December 6501,000December 7651,000December 8701,000December 9401,000December 10751,000 600 10,000Problem 2: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 sample information with mean and range is listed as follows:Sample1234meanrange11010991985986993.002529959961009994998.501539901003101510081004.002541015102010099981010.502251013101910059931007.5026699410019941005998.501179899929821020995.753881001986996996994.751591006989100510071001.75181099210071006979996.0028119961006997989997.001712101999699110111004.2528139819919891003991.002214999993988984991.0015151013100210059921003.0021Develop an .gif”> chart and an R chart and plot the values. From the
charts, what comments can you make about the process?