Stats Doesnt Suck

10: Two Independent Samples t-Test

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Chapter Content

Introduction to the Independent-Measures Design

Independent-Measures and Repeated-Measures Designs

The Null Hypothesis and the Independent-Measures t Statistic

Hypotheses for Independent-Measures t

Structure of the Independent-Measures t

Estimated Standard Error

Pooled Variance

Final Formula and Degrees of Freedom

Hypothesis Tests with the Independent-Measures t Statistic

Example Hypothesis Test

Directional Hypotheses and One-Tailed Tests

Assumptions of the Independent-Measures t

Testing Homogeneity of Variance

Effect Size and Confidence Intervals for the Independent-Measures t

Percentage of Variance Explained, R Squared

Confidence Intervals for Estimating Mean Difference

Factors Affecting Confidence Intervals

Confidence Intervals and Hypothesis Tests

Reporting Results in Literature

The Role of Sample Variance and Sample Size in the Independent-Measures t

Influence of Variance and Sample Size

Chapter 10 Quiz