Chapter_1

# Chapter_1 - STAT 2053 Elementary Statistics Lecture 1 Intro...

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Click to edit Master subtitle style 9/23/11 STAT 2053 – Elementary Statistics Lecture 1 – Intro and Chapter 1 11

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9/23/11 What is Statistics? Statistics is the science of collecting, analyzing, interpreting, and using data in an effective manner. We use statistics to make rational decisions in uncertain conditions. 22
9/23/11 What is Statistics? The volume of data available to us is overwhelming. Think about this: the checkout scanners at Wal-Mart’s 6,500 stores in 15 countries record hundreds of millions of transactions every week, all saved to inform both Wal-Mart and its suppliers. 33

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9/23/11 What is Statistics? Statistics helps us work with, and explain variation. Individuals vary. Measurements on the same individual vary. Almost everything varies over time. 44
9/23/11 Data Definition – An individual is an object described by a set of data. Individuals can be people (or group of people), any animal, or any item. Examples: College Students Automobiles U.S. States or Countries 55

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9/23/11 Data Definition – A variable is any characteristic of an individual. Variables can take different values for different individuals. Examples (Individuals – Variables ) College students – GPA , Major Automobiles – Model , Mileage States/Countries – Population , Age 66
9/23/11 Example SECTION # MALES FEMALES INSTRUCTO R BUILDING 001 27 38 Hunger AG HALL 002 15 50 Knorr CLB 003 40 25 Lin AG HALL 004 35 30 Hatfield CLB 77 Sections of STAT 2013, Fall 2010 Individuals – Sections of STAT 2013 in Spring 2010 (rows) Variables – Section #, # of Males, # of Females, Instructor, Building Data on males/females purely fictional

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9/23/11 Variables Definition – A categorical variable is a variable that places an individual into one of several groups or categories. Categorical variables can take numerical values, but it would not make sense to perform arithmetic on these values. (Example: Zip Codes, ID numbers) Other examples: Gender, Occupation, Genre 88
9/23/11 Variables Definition – A quantitative variable is a variable that takes a numerical value such that arithmetic operations make sense (addition, multiplication, etc.) Examples: mpg, exam scores, racing times All quantitative variables are numbers Many times, values of a quantitative variable are recorded in a unit of measure (seconds, pounds) NOT all numerical variables are quantitative! (See Section # in Example) 99

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9/23/11 Example 1010 Sections of STAT 2013, Fall 2010 Quantitative - # of Males, # of Females Categorical – Section #, Instructor, Building Data on males/females purely fictional SECTION # MALES FEMALES INSTRUCTO R BUILDING 001 27 38 Hunger AG HALL 002 15 50 Knorr CLB 003 40 25 Lin AG HALL 004 35 30 Hatfield CLB
9/23/11 Organizing Data When given a set of data, the first thing we want to do is briefly and simply describe it. Definition

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Chapter_1 - STAT 2053 Elementary Statistics Lecture 1 Intro...

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