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Data Analysis and Graphics Using R, Third Edition by W. John Braun, John Maindonald

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4

A review of inference concepts

A random sample is a set of values drawn independently from a larger population. A (uniform) random sample has the characteristic that all members of the population have an equal chance of being drawn. In the previous chapter, we discussed the implications of drawing repeated random samples from a normally distributed population, where the probability that a value lies in a given interval is governed by the normal density. This chapter will expand upon that discussion by using the idea of a sampling distribution, with its associated standard error, to assess estimation accuracy. Confidence intervals and tests of ...

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