The t-test
The t-test
Outline
Definitions Descriptive vs. Inferential Statistics The t-test
- One-sample t-test
- Dependent (related) groups t-test - Independent (unrelated) groups t-test
Comparing means
? Correlation and regression look for relationships between variables
? Tests comparing means look for differences between the means of two or more samples
? General null hypothesis: the samples come from the same population
? General research hypothesis: the samples come from different populations
Choosing a statistical test: normality
? There are two sets of statistical tests for comparing means:
? Parametric tests: work with normally distributed scale data
? Non-parametric tests: used with not normally distributed scale data and with ordinal data
Choosing statistical tests: how many means?
? Within parametric and non-parametric tests
? some work with just two means ? others work with more than two means
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