Afsnitsforfatter: Danielle J. Navarro and David R. Foxcroft

Summary

In this chapter I have covered two main topics. The first half of the chapter talks about sampling theory, and the second half talks about how we can use sampling theory to construct estimates of the population parameters. The section breakdown looks like this:

• Basic ideas about samples, sampling and populations

• Statistical theory of sampling: the law of large numbers

• Sampling distributions and the central limit theorem

• Estimating population parameters

• Estimating a confidence interval

As always, there is a lot of topics related to sampling and estimation that are not covered in this chapter, but for an introductory psychology class this is fairly comprehensive I think. For most applied researchers you will not need much more theory than this. One big question that I have not touched on in this chapter is what you do when you do not have a simple random sample. There is a lot of statistical theory you can draw on to handle this situation, but it is well beyond the scope of this book.