1. A student wants to develop 3-sigma level variable control charts for the weight of firewood that comes in a box. Due to uneven shape of wood, weight of box varies a lot. Draw X-bar chart and R-chart using the table below. For both charts, calculate and show UCL, CL and LCL. Discuss your results. Weight in pounds from four samplings with sample size of three (n=3) are:

Sampling 1 Sampling 2 Sampling 3 Sampling 4

18 38 22 26

26 30 28 20

26 26 26 26

1. The number of weekly customer complaints are monitored in a hotel using a c-chart. Develop a 3-sigma level control chart using the data below. Calculate and show values for UCL, CL, LCL. Plot the sample data and make a conclusion. Is everything under control?

week	1	2	3	4	5
# of complaint	3	2	3	1	3

For below questions, choose the best answer.

3) A structured approach for integrating the voice of customers into both the product and service development process (capability) is:

1. Quality Function Deployment
2. Ishikawa diagram
3. Design for Manufacturability
4. Concurrent Engineering
5. Lot tolerance Percent Defective

4) The probability of shipping a lot or batch of products whose proportion of defective items is greater than LTPD is called:

1. Producer's risk
2. Consumers risk
3. Alpha
4. Average outgoing quality limit
5. AOQ

5) A P-chart is used to measure:

a) continuous improvement

b) desirable random variation

c) proportion of items in a sample that are defective

d) the count of defective parts

e) a breakthrough change

6) What process capability index (C_p) value implies that the process exceeds minimal capability?

a) 0

b)

c) = 1

d) > 1

e) 6s

7) Which of following is not a good element of Total Quality Management?

a) Top management leadership

b) Differentiation leadership

c) Process management

d) Human resource focus

e) Strategic planning

Factors for 3 Sigma level (page 195 of textbook) Sample Cortrol Limit Factor Size for Sample Macm n 2 1.880 3 1.023 4 0.729 5 0.577 10 0.308 15 0.223 20 0.180 25 0.153 Control Limit Factor for Sample Range D3 D4 0 3.267 0 2.575 0 2.282 0 2.116 0.223 1.777 0.348 1.652 0.414 1.586 0.459 1.541