This chapter is devoted to various aspects of statistical inference, as are parts of nearly all of the following chapters, especially Chapter 14. We wish to know how dependable the figures are that we have computed so far. When we see a result computed to several decimal places, can we trust all of them? We have computed quite a few statistics so far. Are some of them unrealistic? If so, at least we have company, for unrealistic figures exist in other places. Here we are asking two questions: (1) Are the figures we have computed accurate measures of the specific data they are supposed to represent? (2) To what extent do the figures we have calculated apply to other samples we might have measured? Let us now examine the first of these questions.
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