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This chapter is short and simple. It introduces the basic types of groups you'll study, the different types of data that can be collected from those groups, and the various types of studies that can be performed using that data.
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The amount of data produced by research studies can be enormous. In this chapter we learn to organize and summarize raw data into frequency distribution tables, and then graph these tables as bar charts, histograms, polygons, and stem-and-leaf displays.
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Another method for summarizing large data sets is to find a single value that is "typical" of the entire distribution. In this chapter I'll teach you how to find three of these "measures of central tendency": The Mean, The Media, and The Mode - and when you should use each of them.
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How close to the mean are the scores in a sample or population? Are they clustered around the mean, or are they spread out over a large range? This chapter teaches us how to measure the variation among the scores within a distribution.
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A complete set of lessons covering everything in Chapter 5:
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