17SAMPLING DISTRIBUTIONS AND CONFIDENCE
In Chapters 15 and 16, you applied the idea of a probability distribution to examples where a random variable is defined as some measurement or observation of interest. In this chapter, you’ll consider sample statistics themselves as random variables to introduce the concept of a sampling distribution—a probability distribution that is used to account for the variability naturally present when you estimate population parameters using sample statistics. I’ll then introduce the idea of a confidence interval, which is a direct reflection of the variability in a sampling distribution, used in a way that results ...
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