# lec3 - STATISTICS 13 STATISTICS Lecture 3 Lecture Review...

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STATISTICS 13 STATISTICS 13 STATISTICS 13 Lecture 3 Lecture 3 Sept 29, 2010 Sept 29, 2010

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Review Types of variables: qualitative vs. quantitative Population vs. Sample: whole vs. part Summarize data in a table: frequency, relative frequency, percentage Pie chart and bar chart: show data across categories
Occupational Employment Statistics Occupational Employment Statistics (OES) (source: BUREAU OF LABOR STATISTICS ) -- salesmen and cashiers were the two largest occupations in May 2009, representing nearly 1 out of every 17 jobs -- 15 occupations accounted for over one-quarter of U.S. employment --Among them, only 3—general and operations managers, nurses, and elementary school teachers—had mean wages above the U.S. average of \$20.90 per hour or \$43,460 annually

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Occupational Employment Statistics (cont.)
Graphing Quantitative Variables – heat map

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Graphing Quantitative Variables –time series A single quantitative variable measured over time is called a time series Example: Example: Employment level (source: BUREAU OF LABOR STATISTICS )

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More Graphical Tools From raw data Dotplots From frequency table Histograms
Dotplot Represent each measurement as a dot on the real line Stack the dots vertically if the measurement is repeated Example : 8 used cars for sale on craigslist: 3, 4, 5, 3, 5, 2, 7, 3 (years)

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lec3 - STATISTICS 13 STATISTICS Lecture 3 Lecture Review...

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