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Slides Prepared by JOHN S. LOUCKS St. Edward抯 University Chapter 7 Sampling and Sampling Distributions Simple Random Sampling Point Estimation Introduction to Sampling Distributions Sampling Distribution of Sampling Distribution of Sampling Methods n = 100 n = 30 Statistical Inference The purpose of statistical inference is to obtain information about a population from information contained in a sample. A population is the set of all the elements of interest. A sample is a subset of the population. The sample results provide only estimates of the values of the population characteristics. A parameter is a numerical characteristic of a population. With proper sampling methods, the sample results will provide 揼ood?estimates of the population characteristics. Simple Random Sampling Finite Popu