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QMS 102 (49)
Chapter 2

QMS 102 - Chapter 2 Notes.docx
QMS 102 - Chapter 2 Notes.docx

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Ryerson University
Quantitative Methods
QMS 102
Boza Tasic

QMS 102 – Chapter 2 Notes Graphical Presentation of Qualitative Data Cannot perform calculations on qualitative (nominal or ordinal) data Can perform calculations on # of responses on each category Graphical presentation data used for: Bar charts (horizontal/vertical) bar shows each categories length represents amount, frequency or percentage values in each category Pie charts a circle broken into slices that represent categories the size of each slice varies according to percentage in each category Pareto charts named after the 19 century Italian economist Vilfredo Pareto his research discovered that 80% of the wealth in a country is owned by 20% of the population generalized by the 80/20 rule the chart is a combination of vertical lines (categories are shown in descending order of frequency) a cumulative polygon shown in the same graph used to spread the vital few from the trivial many Stem-and-Leaf Plot an easy way to summarize the distribution/shape of quantitative data see where concentration of quantitative data exists retain most of the data values (numbers) used if data sets has no more than 50 values separating data into leading digits (stems) and trailing digits (leaves) decimal system is the most common base of representation of #s The Stem Rules 1) # of stems should be from 6 to 13 2) stem values should be consecutive #s or repeated #s, #s can be repeated twice or five tim
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