6 - September 18 Describing Data

6 - September 18 Describing Data - "It takes courage...

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Unformatted text preview: "It takes courage to grow up and turn out to be who you really are." E. E. Cummings REMEMBER: 1 ST EXAM Thursday September 27 Statistics Welcome to the World of Stats! MIS An organized collection of people, people procedures, databases and devices to provide routine information to managers and decision makers. The systematic study of data To provide insight into problems affecting: - Business, - Scientific, - Societal, - Political, - Or any other arena. Statistics The Role of Statistics Types of Statistics Types of Data Variables of Data Collection Levels of Measurement Types of Statistics Descriptive Census Inferential Population Sample Types of Data Available Anecdotal Observational Experimental Population Vs. Sample A population is an entire group of objects about which insight or information is desired. A sample is a subset of the population that is used to gain information about the entire population. Population Sample Parameter ... a characteristic of a population Statistic ...a characteristic of a sample Population/Parameter Sample/Statistic Variables of Data Collection Qualitative Quantitative Discrete Continuous Variables of Data Collection Qua L itative Qua N titative Levels of Measurement (Scales of Measurement) Nominal Ordinal Interval Ratio Levels of Measurement (Scales of Measurement) N Black O I R In French Nominal Data Measurement simply identifies the group to which an item belongs -Classification -Category -Qualitative Nominal Data Measurement simply identifies the group to which an item belongs Gender: - Female - Male F M 1 2 3 - Unknown U Ordinal Data Measurement identifies if one item has more of the property than another item - Rank - Sequence Ordinal Data Measurement identifies if one item has more of the property than another item Population -Waco - Austin - San Antonio - Dallas - Houston /1000 1 2 3 4 5 Rank 5 4 3 2 1 Interval Data Measurement identifies if one item differs from another by a certain (additive) amount Temperature 0, 50, 75, 100 Degrees Ratio Data Measurement identifies how many times more of the property one item has than another Wealth 0, 50, 75, 100 Dollars **ZERO MEANS NOTHING Note to Self: Do NOT get behind In Stats! ...
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This note was uploaded on 03/01/2008 for the course MIS 311F taught by Professor Cleveland during the Fall '07 term at University of Texas.

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