Math203 Ch2 notes

Math203 Ch2 notes - Chapter 2 Organizing Qualitative Data...

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Chapter 2
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Organizing Qualitative Data Frequency Distributions A two-column chart listing the categories and frequencies Total frequency = total number of observations Relative Frequency Distribution Reports relative frequencies instead of frequencies Relative frequency = frequency/total Total relative frequency=1 (because of rounding, sometimes it is only close to 1) Relative frequency may be reported as a percentage Grade Frequency A 12 B 5 C 7 Grade Relative frequency A 0.5 B 0.21 C 0.29
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Organizing Qualitative Data Bar chart Lists categories with bars that are the frequency in length Often vertical but may be horizontal 0 20 40 60 80 100 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 2003 Quarters Total Book Sales 0 50 100 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr 2003 Quarters Total Book Sales 0 50 100 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr East East West North
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Organizing Qualitative Data Pareto Chart A bar chart with the bars organized from most to least 0 20 40 60 80 100 3rd Qtr 2nd Qtr 1st Qtr 4th Qtr
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Organizing Qualitative Data Pie Chart A circle segmented based on relative frequencies as percentages. Each segment represents a different category 1st Qtr 13% 2nd Qtr 17% 3rd Qtr 57% 4th Qtr 13%
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Organizing Quantitative Data Frequency Distribution Class : The set of numbers we are determining the frequency Class limits : smallest & largest numbers that can be included in a class Lower limit : the smallest Upper limit : the largest Class width : the range of numbers that can be in a class Class Boundaries : are used to make sure we do not overlap the class limits Lower boundary & Upper boundary Class Midpoint : the middle of the class Ages Class limit Class Boundary Frequency 32-39 31.5-39.5 12 40-47 39.5-47.5 5 48-55 47.5-55.5 7 56-63 55.5-63.3 6
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Math203 Ch2 notes - Chapter 2 Organizing Qualitative Data...

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