Operations Management 200.Doc Essay

1011 words - 5 pages

MGT2320 Online – Assignment 3

There are 5 questions.

You must show all calculations.

1. A list of 7 defects that lead to defects and the number of occurrences in a printed-circuit-board assembly line appear below:

|Defect |Number of Defect Occurrences |
|Components not adhering |143 |
|Excess adhesive |71 |
|Misplaced transistors ...view middle of the document...

78 kg.

A) Determine the upper and lower control limits of the X bar chart where the standard deviation is = 3. (3 marks)

X bar Chart:

Upper Control Limit:

UCL = m + (3/Ön) s

= 57.75 + (3 / Ö 7) * 3

= 61.1517

Lower Control Limit:

LCL = m - (3/Ön) s

= 57.75 - (3 / Ö 7) * 3

= 54.3483

B) Determine the upper and lower control limits of the R chart where the standard deviation is = 3. (3 marks)

R Chart:

Upper Control Limit:

UCL = D4 * s

= 1.924 * 3

= 5.772

Lower Control Limit:

LCL = D3 * s

= 0.076 * 3

= 0.228

3. Twelve samples, each containing 5 parts, were taken from a process that produces steel rods. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were:

|Sample |Sample Mean (in.) |Range (in.) |
|1 |10.002 |0.011 |
|2 |10.002 |0.014 |
|3 |9.991 |0.007 |
|4 |10.006 |0.022 |
|5 |9.997 |0.013 |
|6 |9.999 |0.012 |
|7 |10.001 |0.008 |
|8 |10.005 |0.013 |
|9 |9.995 |0.004 |
|10 |10.001 |0.011 |
|11 |10.001 |0.014 |
|12 |10.006 |0.009 |

A)...

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