plugin-Chapter 12b Students

# plugin-Chapter 12b Students - Displaying Distributions with...

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CHAPTER 12B Displaying Distributions with Numbers

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DESCRIBING DISTRIBUTIONS Describing the center and spread of a distribution using words is inadequate. Instead, we want to describe these topics using numbers. Last class: Median Quartiles Five-number summary Boxplot
MEAN This is actually the most common method used to describe the center of a distribution. The mean is essentially the average. To find the mean of n observations, you add up the values and divide by n . The symbol we use for mean is (pronounced as x-bar). x

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EXAMPLE 12.3 Let’s say we ask 5 UK employees how long it take them to commute to work. Here are the results (all in minutes): 5 15 17 25 53 Use the mean to describe the center of the dataset. How does it compare to M?
SPREAD (VARIABILITY) If all values are the same, then they all equal the mean. There is no spread. Variability exists when some values are different from (above or below) the mean.

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plugin-Chapter 12b Students - Displaying Distributions with...

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