The Assumptions of the Wilcoxon Signed-Rank Test Are That

Multiple Choice

The assumptions of the Wilcoxon signed-rank test are that:

A) the difference between pairs of scores can be ranked, participants are randomly selected, and the population distribution of differences is symmetric.
B) the mean difference between pairs of scores is 0, participants are randomly selected, and the population is symmetric.
C) participants are randomly selected and the population is symmetric.
D) the mean of the population of difference scores is 0 and its distribution is symmetric.