Chapter 1.2（课件）- 《统计学基础（英文版）》同步教学（人民大学版）

Chapter Introduction to Statistics 1 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. 1 Larson/Farber 7th ed Chapter 1 Chapter Outline 1.1 An Overview of Statistics 1.2 Data Classification 1.3 Data Collection and Experimental Design 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 2 Section 1.2 Data Classification 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 3 Section 1.2 Objectives How to distinguish between qualitative data and quantitative data How to classify data with respect to the four levels of measurement: nominal, ordinal, interval, and ratio 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 4 Types of Data Qualitative Data Consists of attributes, labels, or nonnumerical entries. Major Place of birth Eye color 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 5 Types of Data Quantitative data Numerical measurements or counts. Age Weight of a letter Temperature 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 6 Example: Classifying Data by Type The table shows sports-related head injuries treated in U.S. emergency rooms during a recent five-year span for several sports. Which data are qualitative data and which are quantitative data? (Source: BMC Emergency Medicine) 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 7 Solution: Classifying Data by Type Quantitative Data (Head injuries treated are numerical entries.) Qualitative Data (Types of sports are nonnumerical entries.) 1 Copyright 2019, 2015, 2012, Pearson Education, Inc. Chapter 1 Larson/Farber 7th ed 8 Levels of Measurement Nominal level of measurement Qualitative data only Categorized using names, labels, or qualities No mathematical computations can be made Ordinal level of measurement Qualitative or quantitative data Data can be arranged