LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

**B.Sc.** DEGREE EXAMINATION – **STATISTICS**

SIXTH SEMESTER – **APRIL 2012**

# ST 6605/ST 6602 – STATISTICAL PROCESS CONTROL

Date : 20-04-2012 Dept. No. Max. : 100 Marks

Time : 1:00 – 4:00

__PART – A__

**Answer All the questions: (10×2=20marks)**

** **

- What is quality?
- Write the need of Total Quality Management.
- Write the purpose of Histogram.
- Explain Q-Q Plot.
- What is statistical process control?
- Define ‘C’ chart.
- Explain process capability analysis.
- Explain the concept of subgroups.
- What is Acceptance Sampling?
- Explain consumer’s risk and producer’s risk.

__PART – B__

** **

**Answer any FIVE questions: **** ****(5×8=40marks)**

** **

- Describe Quality improvement in the modern business environment.
- Explain the concept of 3-sigma limits. When do you say the process is out of control?
- Describe the Box plot technique.
- Describe process-capability analysis using a Histogram.
- Explain the construction ofand R charts.
- Write the advantages of acceptance sampling.
- What are the basic principles of CUSUM control chart?
- Explain the technique of single sampling plan for attributes.

__PART C__

**Answer any TWO questions:**** ****(2X20=40marks)**

__ __

- (a) State the requirements for successful implementation of TQM.

(b) Discuss the relation between quality improvement and productivity.

- (a) Draw the stem and leaf plot for the following data:

13,15,16,22,24,28,35,32,37,26,41,85,66,45,46,49,44,50,54,58,57,59,61,62,65,93,78,74,72,77,81,82,95,34,38,39,53,55,47,64,

(b) Explain Frequency distributions and its applications.

- (a)Explain the construction of any two control charts for attributes.

(b) Write the applications of u chart and np chart.

- (a) Explain the construction of CUSUM control chart.

(b) Explain double sampling plan in detail.

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