UT Knoxville STAT 201 - Chapter 2 (18 pages)

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Chapter 2



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Chapter 2

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Pages:
18
School:
University of Tennessee
Course:
Stat 201 - Introduction to Statistics
Introduction to Statistics Documents

Unformatted text preview:

Chapter 2 Data In God We Trust all others bring data Unknown Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 1 A Simple Survey Gender Number of siblings Number of countries ever visited Height Favorite coffee flavor at Starbucks Shoe size How could there be problems with responses to this survey Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 2 Class Activity In groups of 2 or 3 discuss possible problems one might have with getting accurate answers to the questions outlined on the previous page Be prepared to discuss what you and your teammate discussed with the class Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 3 Real Data Can Be Messy Different units of measure Ambiguous questions lead to ambiguous data Non response how will we handle Seemingly ridiculous responses how will we handle An important first step in getting meaningful data is carefully planning the data collection activity AND clearly defining the questions Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 4 What Are Data Data can be numbers record names or other labels Not all data represented by numbers are numerical data e g 1 male 2 female Data are useless without their context Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 5 Raw data What does this data tell us What does it mean Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 6 Data in a context When the data are organized given labels and put into a context the data gain meaning Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 7 The W s To provide context we need the W s Who What and in what units When Where Why if possible and How of the data Note the answers to who and what are essential Chapter02 Presentation 1213 Copyright 2009 Pearson Education Inc 8 2 Types of Variables A categorical or qualitative variable is one whose possible values are given by short descriptors Sex male female eye color blue brown favorite food birth



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