Try the following self-assessment questions. When you have decided on your answer, mouse over the answer button to check:

1. For each of the following features, say whether it applies to a Wilcoxon signed-rank test.

- Parametric test.
- Numbers plugged into the formula for the statistic are frequencies .
- Numbers plugged into the formula for the statistic are based on the ranks of the differences between related data in two samples.
- Used for assessing the differences betwen more than two samples.
- Used on unrelated data.
- Reject the null hypothesis if the calculated statistic is less than or equal to the critical value of the statistic from the table.
- Reject the null hypothesis if
*P*on the SPSS printout is less than 0.05.