Chapter 15

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# Chapter 15 - PowerPoint PPT Presentation

Chapter 15. Strategies When Population Distributions are Not Normal: Data Transformations and Rank-Order Tests. Assumptions in the Standard Hypothesis-Testing Procedures. Populations follow a normal curve Populations have equal variances Ceiling and floor effects. Data Transformations.

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## PowerPoint Slideshow about 'Chapter 15' - skipper

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Presentation Transcript
Chapter 15

Strategies When Population Distributions are Not Normal:

Data Transformations and

Rank-Order Tests

Assumptions in the Standard Hypothesis-Testing Procedures
• Populations follow a normal curve
• Populations have equal variances
• Ceiling and floor effects
Data Transformations
• Data transformation
• Square-root transformation
Data Transformations
• Legitimacy of data transformations
• Kinds of data transformations
• Square root transformation
• Log transformation
• Inverse transformation
• Arcsine transformation
Rank-Order Tests
• Rank-order transformation
• Rank-order tests
• Nonparametric tests
• Parametric tests
Rank-Order Tests
• Basic logic
• The null hypothesis
• Normal curve approximations
• Using parametric tests with rank-transformed data
Comparison of Methods