Statistical Testing

• Chi-squared test is used for nominal data when the test of difference is unrelated or correlational
• Sign Test is used for nominal data when the test of difference is related
• Mann-Whitney U test is used for ordinal data when the test of difference is unrelated
• Wilcoxon test is used for ordinal data when the test of difference is related
• Spearman's Rank is used for ordinal data when the test of difference is correlational
• Unrelated T-test is used for interval data when the test of difference is unrelated
• Related T-test is used for interval data when the test of difference is related
• Pearson's R is used for interval data when the test of difference is correlational
• The unrelated test of difference is used for independent groups design
• The related test of difference is used for repeated measures and matched pairs designs
• The measure of central tendency for nominal data is the mode
• The measure of central tendency for ordinal data is median
• The measure of central tendency for interval data is mean
• The measure of dispersion for ordinal data is range
• The measure of dispersion for interval data is standard deviation