Making Inferences About Process Quality


In the previous chapter, we discussed probability distributions of discrete and continuous random variables and studied several of the distributions. The understanding and knowledge of these distributions are critical in decisions involving quality-related problems. This chapter extends the concept of probability distribution to that of sample statistics. Sample statistics are measures calculated from the sample data to describe a data set. The commonly used sample statistics are the sample size (n), sample mean (), sample variance (s2), sample standard deviation (s), and sample proportion (). Note that some quality characteristics are expressed in proportion or percent. For ...

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