Idiot's Guides: Statistics, 3E by Donnelly Robert A. & Abdel-Raouf Fatma

Author:Donnelly, Robert A. & Abdel-Raouf, Fatma [Donnelly, Robert A.]
Language: eng
Format: epub
Publisher: DK Publishing
Published: 2016-07-12T04:00:00+00:00

CHAPTER

13

Sampling Distributions

In This Chapter

Using sampling distributions of the mean and proportion

Working with the central limit theorem

Using the standard error of the sampling mean and proportion

In Chapter 12 , we praised the wonders of using samples in our statistical analysis because it was more efficient than measuring an entire population. In this chapter, we’ll discover another benefit of using samples–sampling distributions.

Sampling distributions describe how sample averages behave. You may be surprised to hear they behave very well–even better than the populations from which they are drawn. Good behavior means we can do a pretty good job at predicting future values of sample means with a little bit of information. This might sound a little puzzling now, but by the end of this chapter you’ll be shaking your head in utter amazement.

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