Sampling joke: “If you don’t believe in random sampling, the next time you have a blood test, tell the doctor to take it all.” At the beginning of Chapter 7 we introduced the ideas of population vs. sample and parameter vs. statistic. We build on this in the current chapter. The key concept in this chapter is that if we were to take different samples from a distribution and compute some statistic, such as the sample mean, then we would get different results.
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