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Lean Six Sigma and Statistical Tools for Engineers and Engineering Managers by Xuru Ding, Wei Zhan

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CHAPTER 2

Probability and Statistics

In engineering designs, we often face two problems: how to predict the results based on the knowledge of probability and how to draw a conclusion about the entire population from a set of sampled data. We apply the probability theory to solve the first problem and statistics to solve the second. Statistics is widely used in Lean Six Sigma projects. The fundamental concepts of statistics required for learning Lean Six Sigma are covered in this chapter. More advanced tools, such as hypothesis testing, are discussed in Chapter 4.

2.1 Why is Statistics Relevant to Engineers?

Designing products and conducting tests are important parts of an engineer’s job, whose decision making usually involves analysis of measured ...

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