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The process control in any manufacturing company is very critical. The control limits are used to guide managers in understanding the control limits in their operation. This assignment is a study of international scenarios and control limits.

Process Control A process for producing electronic circuits has achieved very high yield levels. An average of only 10 defective parts per million is currently produced. 1. What are the upper and lower control limits for a sample size of 100?
Solution:
The ULC= PBAR+ 3 √Pbar (1-pbar)/n
The LCL=PBAR- 3√pbar(1-pbar)/n
Where
P= observed percent defective
N= Large unit number
Assuming the defects are represented by
Pbar =10/1000000*100= 0.001 n = 100
UCL = 0.001+3√0.001(1-0.001)/100= 0.0019
LCL = 0.001-3√0.001(1-0.001)/100= 0
Note: When the LCL is negative, it is rounded up to 0 because a negative percentage is impossible.

2. To be recomputed for a 10,000 units
ULC = 0.001+3√ .001(1-.001)/10,000 = 0.0010
LCL= 0.001-3√ .001(1-.001)/10,000 = 0.0009
Thus: The 1ST UCL and LCL is recommended because there is a zero chance of process getting out of control in the lower control limit.
Exercise 2 Scenario:
Management has reconsidered the method of quality control and has decided to use process control by variables instead of attributes. For variables control a circuit voltage will be measured based on a sample of only five circuits. The past average voltage for samples of size 5 has been 3.1 volts, and the range has been 1.2 volts. 1. What would the upper and lower control limits be for the resulting control charts (average and range)? 2. Five samples of voltage are taken with the results in the table below. What action should be taken if any?
Discuss the pros and cons of using this variables control chart versus the control chart discussed in the first part of the assignment. Which do

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