Chapter 8. Fundamental Sampling Distributions and Data Descriptions8.1 Random Sampling ▪A populationconsists of the totality of the observations with which we are concerned. ▪A sampleis a subset of a population. ▪Let 12,,,nXXX…be nindependent random variables, each giving the same probability distribution ( )f x. We then define 12,,,nXXX…to be a random sampleof size of nfrom the population ( )f xand write its joint probability distribution as 1212(,,,)()()()nnf xxxf xf xf x=…"
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