Fundamentals of Quality Control and Improvement, 4th Edition

7Control Charts for Variables

1. 7-1 Introduction and chapter objectives
2. 7-2 Selection of characteristics for investigation
3. 7-3 Preliminary decisions
4. 7-4 Control charts for the mean and range
5. 7-5 Control charts for the mean and standard deviation
6. 7-6 Control charts for individual units
7. 7-7 Control charts for short production runs
8. 7-8 Other control charts
9. 7-9 Risk-adjusted control charts
10. 7-10 Multivariate control charts
11. Summary

Symbols
μ	Process (or population) mean	ki	Standardized value for range of sample number i
σ	Process (or population) standard deviation	σ0	Target or standard value of process standard deviation
	Estimate of process standard deviation		Standard deviation of the sample mean
	Sample average
R	Sample range	Sm	Cumulative sum at sample number m
s	Sample standard deviation	w	Span, or width, in calculation of moving average
n	Sample or subgroup size
Xi	ith observation		Mean of sample means
W	Relative range		Mean of sample ranges
g	Number of ...