Stats Doesnt Suck

9: One-Sample t Test

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Chapter Content

The t Statistic: An Alternative to z

Circumstances for Using t Instead of z

Computing the t Statistic

Degrees of Freedom and the t Statistic

Hypothesis Tests with the t Statistic

Unknown Population for t Tests

Example Hypothesis Test with t

Assumptions of the t Test

Influence of Sample Size and Variance

Measuring Effect Size for the t Statistic

Estimated Cohen’s d

Percentage of Variance Explained, R Squared

Factors Affecting Effect Size

Confidence Intervals for Estimating μ

Factors Affecting Confidence Intervals

Directional Hypotheses and One-Tailed Tests

Example of a One-Tailed t Test

Determining the Critical Region