STA 200 chapter1

STA 200 chapter1 - Chapter 1 Where Do Data Come From?...

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Chapter 1 Where Do Data Come From?
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Individuals and Variables Individuals  are objects described by a  data set.  In a lot of data sets, the  individuals will be people, but this doesn’t  have to be the case. Variables  are characteristics of  individuals.
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Example:  Best-Selling Albums in  the U.S.  (source: RIAA) Artist Album Year of  Release Genre Sales (in  millions) Eagles Greatest Hits 1975 Country Rock 29 Michael  Jackson Thriller 1982 Pop 27 Pink Floyd The Wall 1979 Progressive  Rock 23 Led Zeppelin IV 1971 Rock 23 AC/DC Back in Black 1980 Hard Rock 22 Billy Joel Greatest Hits  Vol. I and II 1985 Pop 21 Garth Brooks Double Live 1990 Country 21
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Example (cont.) On the previous page, the variables are: Artist Album Year of Release Genre Sales (in millions)
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Observational Studies vs.  Experiments An  observational study  is a study that  observes individuals and measures variables 
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STA 200 chapter1 - Chapter 1 Where Do Data Come From?...

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