Chapter 1 - Chapter 1 Where Do Data Come From? Outline...

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Chapter 1 Where Do Data Come From?
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Outline STATISTICS? OBSERVATIONAL STUDIES SAMPLE SURVEY CENSUS EXPERIMENTAL STUDIES
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Statistics
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Definition: Statistics A mathematical science pertaining to the collection, analysis, interpretation or explanation, and presentation of data - wikepedia The mathematical study of the likelihood and probability of events occurring based on known information and inferred by taking a limited number of samples – mathworld The science or “art” of data – Moore & Notz
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More Definitions: Individuals – the objects described by a set of data. Individuals may or may not be people Ex – cars, plants, people Variable – any characteristic of an individual/object in a data set. A variable takes on values that may or may not be numeric Ex – height, weight, speed, eye color, grade
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Example of a Data Set Plant # Num. Of leaves Gender Height 1 37 Male 17.5 2 42 Male 12.4 3 12 Female 9.8 Which are the individuals? A. 17.5 B. 37 C. Plant 2 D. Male
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Example of a Data Set Plant # Num. Of leaves Gender Height 1 37 Male 17.5 2 42 Male 12.4 3 12 Female 9.8 Which is a variable? A. 42 B. male C. Plant # D. Gender
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Example of a Data Set Plant # Num. Of leaves Gender Height 1 37 Male 17.5 2 42 Male 12.4 3 12 Female 9.8 Which is a value of a variable? A. 1 B. Female C. Height D. Num. of leaves
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Definitions: An observational study observes and measures variables of interest. An
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Chapter 1 - Chapter 1 Where Do Data Come From? Outline...

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