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Instrumentation

Chapter Outline

What are Data?

Key Questions
Validity, Reliability, and Objectivity
Usability

Means of Classifying Data-Collection Instruments

Who Provides the Information?
Where did the Instrument Come From?
Written Response Versus Performance

Examples of Data-Collection Instruments

Researcher-Completed Instruments
Subject-Completed Instruments
Unobtrusive Measures

Types of Scores

Raw Scores
Derived Scores
Which Scores to Use?

Norm-Referenced Versus Criterion Referenced Instruments

Norm-Referenced Instruments
Criterion-Referenced Instruments

Measurement Scales

Nominal Scales
Ordinal Scales
Interval Scales
Ratio Scales
Measurement Scales Reconsidered

Preparing Data for Analysis

Scoring the Data
Tabulating and Coding the Data










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