Parametric tests of difference: Wilcoxon t-test

• A test of difference
• Levels of measurement: Interval data
• Research design: Independent groups design.
• Homogenity of variance is assumed - normally distributed sample.

Because it is unrelated, to work out degrees of freedom you do: No. participants -2

• A test of difference
• Levels of measurement: Interval data
• Research design: Repeated measures design & matched pairs
• Homogenity of variance is assumed - Normally distributed samples

Because it is related, to work out degrees of freedom you do: No. participants -1.