6 misleading uninteresting graphs chapter 2 chapter

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Unformatted text preview: ter 29 Histogram Histogram • Now create the histogram that Now corresponds to the frequency distribution you created for the Downtown Automotive data set data – Place it beside the frequency distribution you Place created created • Are you satisfied with the way your work Are summarizes the data? summarizes Chapter 2 30 Frequency Distributions • How wide should the categories (classes) How be? be? – Between 5 & 20 classes – If classes are too narrow Too many classes The data are not summarized effectively – If classes are too wide Too few classes The table will hide interesting characteristics – More art than science Chapter 2 Chapter 31 Frequency Distributions • No template? – Use maximum value - minimum value class width = n for guidance Or width = (Max – Min) / # of classes Chapter 2 Chapter 32 Frequency Distributions Considerations for setting up classes 1. Classes should not overlap Class $2,000-$4,000 $4,000-$6,000 Number of Data Number Points Points Where does Where $4,000 belong? $4,000 Chapter 2 Chapter 33 Frequency Distributions Considerations for setting up classes 1. Classes should not overlap 2. Classes should be the same width, & Classes open-ended classes should be avoided open-ended Class $2,000 to <$4,000 $4,000 to <$6,000 $6,000 to <$8,000 Number of Data Number Points Points $2,000 $2,000 Chapter 2 Chapter 34 Histograms Canadian Oil & Gas Extraction & Support Activities Quarterly Operating Profi...
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This note was uploaded on 01/22/2014 for the course ECONOMIC 2122 taught by Professor A during the Fall '12 term at UWO.

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