CHAPTER 7

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Summarizing and Describing Data

In this chapter, you learn how to summarize and describe data measured at the interval or ratio level. We will lump interval and ratio measures together and call the combination “scale” data because these types of measurement have equal intervals between successive data values.

Chapter 6 showed how to summarize categorical data using the table() function. This function works in the same fashion for scale data to produce simple frequency tables. With small datasets, simple frequency tables are fine, but with larger datasets, we need a way to group the data by intervals to keep the frequency table from being ...

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