- This test compares the MEANS from within the group/condition.

Conditions

- Data is INTERVAL or RATIO
- The differences between scores of the two conditions need to be normally distributed!
- N>=12.
- (T-test general assumptions)

If these assumptions are violated, use the non-para alternative, Wilcoxon-signed-ranks test. This test is based on ranks, results are ordered from low to high. The important value is W, the smallest of the 2 sums of ranks.

- At least 6 participants.
- Two data points per participant.
- Data is at least ORDINAL level.

Non-para tests are generally less powerful than para and so you are more likely to make type 2 errors. But, there are less rules and assumptions to violate.

## Comments

No comments have yet been made