PPT Slide
Analysis 101: Special considerations
The t-test has 3 basic, fundamental underlying assumptions:
1) Outcomes are Normally distributed
- test assumptions of Normality
- use non-parametric tests
2) Outcomes are independent
- if outcomes are from same subjects, use paired t-test
3) The variance of each group is similar
- stats package should formally test equality of variances
- different p-values for each condition