Final answer:
The Wilcoxon Signed-Rank Test is used to test for a significant difference between paired observations. Treatment effects would cause scores in one condition to be lower, indicating improvement.
Step-by-step explanation:
The Wilcoxon Signed-Rank Test is used to test whether there is a significant difference between paired observations. In the context of treatment effects, the scores in one condition would be expected to be lower after the treatment. This indicates improvement because a decrease in scores suggests a reduction in the measured variable, such as pain or symptoms.