The one sample t-test is compared with the Wilcoxon Signed-Rank test for identical data sets representing various Likert scales. An empirical approach is used with simulated data. Comparisons are based on observed error rates for 27,850 data sets. Recommendations are provided.
Meek, Gary E.; Ozgur, Ceyhun; and Dunning, Kenneth
"Comparison of the t vs. Wilcoxon Signed-Rank Test for Likert Scale Data and Small Samples,"
Journal of Modern Applied Statistical Methods:
1, Article 10.
Available at: http://digitalcommons.wayne.edu/jmasm/vol6/iss1/10