ABSTRACT

The data was collected from monthly files of the Quality controldepartment of Ebony Paints Industry. In this work, the actual measured quality haracterstics of Bone white speedy Emulsion and Bone white speedy oil paint were considered f injanuary 1997 to August 1999. Tue ultimate objective of the study was to construct control chart which could be used to study the production process of the quality characteristics of the two types of paints. The  statistical quality control technique used for this study was process ontrol (by control chart devices). The quality characteristics investigated was the viscosity in Kp. and the grade level in grammes per litre of the two types of paints. F: r a more stable process variablity and mean, the points that lie outside e warning and action limits were discarded and the control limits were rescd. A the end of the study, it was concluded that Ebony Paints should not be reject d for its purpose. Thus, absolute rejection of their product should be based .)fl their standard not this estimated standard (control limits).

TABLE OF CONTENT

DED1CT1ON .1

ACKNOWLEDGEMENT ......... ...ii

CERTIFICATION... ..iii

ABSTRACT ......

OF TABLES/FIGURES

CHAPTER  ONE: INTRODUCTION

1.1 B4ckground of Study ... 1

1.2 Statement of Problem 2

1.3 Rtionale for Study

1.4 Arns and Objectives 4

1.5 S pe of Study .4

1.6 R.:viewofRelated Literature 5

1.7 Method of Analysis .6

1.8 0u3anisati0n of Work 9

1.9 D :finition of Concepts 10

CHAP'IER TWO:

D.JA COLLECTION FOR TIlE STUDY

2.1 Biif Idea of the Production Process 12

2.2 D. .a Source and Limitation 13

2.3 Snp1es and Method of Inspection 15

CHAPT R THREE:

3.1 Tc tbr Normality .. 18

3.1.1 Te t for Normality of Viscosity of Oil Paint ..21

3.1.2 Te .t for Normality of Grade level of Oil Paint .22

3.1.3 Te L for Normality of Viscosity of Emuslion Paint 23

3.1.4 1'est br Normality of Grude Level of Emulsion PainL 2

3.2 1uns Test for Randomness 26

3.2.1 Tst for Randomness of Grade Level of Emulsion Paint 27

3.2.2 Test for Randomness of Viscosity of Emulsion Paint 28

3.2.3 Test fbr Randomness of Grade of Oil Paint 29

3.2.4 T.st for Rndomness of Viscosity of Oil Paint ..29

3.3 Control Charts 31

3.3.1 S Chart for Grade Level of Emulsion Paint 37

3.3.2 S Chart for Viscosity of Emulsion Paint 38b

3.3.3 S - Chart for Grade Level of Oil Paint

3.3.4 S - Chart for Viscosity of Oil Paint . .

3.4.1 ) - Chart for grade level of Emulsion paint .44

3.4.2 X Chart for Viscosity of Emulsion Paint 46

3.4.3 Y - Chart for Grade Level of Oil Paint ... 49

3.4.4 X Chart for Viscosity of Oil Paint... .52

CHAPTER FOUR

4.0 S JMMARY/RECOMMENDATION/CONCLUSION

4.1 Summary...

4.2 Recommendation

4.3 Conclusion

BIB L1O RAPHY ... 59

APPEN ICES .61

A Rc om mended Control Limits 61

B O:g1na1 Data on Grade Level of Emulsion Paint ..62

C O .gina1 Data on Viscosity fo Emulsion Paint 64

D Oi ginal Data on Grade Level of Oil Paint... 66

E Ot :inal Data on Viscosity of Oil Paint 68