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Statistical Process Control for Quality Improvement: A Training Guide to Learning SPC by James R. Evans - Department of Quantitative Analysis and Information Systems, College of Business Administration University of Cincinnati

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5 Frequency Distributions and Histograms

In this chapter we shall lay the foundation for process capability analysis. We need to be able to describe and summarize large groups of data. Frequency distributions and histograms are very useful tools for doing this.

5-1. Simple Frequency Distributions

Suppose we have data on the number of automobiles sold each week for 10 weeks by an individual salesperson:

image

Looking at these data, you see that the salesperson sold either 0,1, 2 or 3 automobiles each week. However, data that are simply listed in this way are difficult to understand and interpret. (Just imagine several hundred measurements of production ...

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