Transcription of Chapter 5 Measurement Operational Definitions
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5-1. Chapter 5. Measurement Operational Definitions Numbers and Precision Scales of Measurement Nominal Scale Ordinal Scale Interval Scale Ratio Scale Validity of Measurement Content Validity Face Validity Concurrent Validity Predictive Validity Construct Validity Thinking Critically About Everyday Information Reliability of Measurement Test Retest Reliability Alternate Form Reliability Split-Half Reliability Factors That Affect Reliability Case Analysis General Summary Detailed Summary Key Terms Review Questions/Exercises 5-2. Operational Definitions An essential component of an Operational definition is Measurement . A simple and accurate definition of Measurement is the assignment of numbers to a variable in which we are interested. These numbers will provide the raw material for our statistical analysis.
Precision is important in all areas of our lives, especially in the sciences and technologies, and we look for ways of increasing it. Here is an interesting classroom demonstration of the precision of numbers versus the precision of words Ask the class members to write down on a piece of paper what number the word “several” represents to them.
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