plugin-Chapter 12a Students

plugin-Chapter 12a Students - Describing Distributions with...

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CHAPTER 12A Describing Distributions with Numbers
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DESCRIBING DISTRIBUTIONS As we discussed in the previous chapter, we always describe a distribution with some sort of graphical display (e.g. histogram, stemplot). Describing the center and spread of a distribution using words is inadequate. Instead, we want to describe these topics using numbers.
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MEDIAN The median is the midpoint of a distribution; this means that it is the number such that half the observations are smaller and the other half are larger. We use M as the symbol for the median. First, sort your observations in ascending order (from lowest to highest). If we have an odd number of observations, our value of M is given by the number in the very middle. If we have an even number of observations, our value of M is given by the average of the two middle numbers.
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EXAMPLE 12.1 Here are Hank Aaron’s home run counts for his 23 years in baseball. To find the median, first arrange them in order
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This note was uploaded on 08/05/2011 for the course STA 200 taught by Professor Wierdhobbitguy during the Summer '08 term at Kentucky.

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plugin-Chapter 12a Students - Describing Distributions with...

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