Chapter 1. About Data

1.1 Introduction 2

1.2 Why Data Are Needed 4

1.3 Sources of Data 5

1.3.1 Existing Data versus New Data 5

1.3.2 Existing Data 6

1.3.3 New Data 7

1.4 Data Scales 11

1.4.1 Ratio Scale 13

1.4.2 Interval Scale 13

1.4.3 Ordinal Scale 13

1.4.4 Nominal Scale 13

1.4.5 Likert Scale 14

1.5 Summary 15

1.6 Problems 16

1.7 Case Study: Green's Gym—Part 1 17