SPSS Tutorial: How to compare scale means for two or more groups of small sample participants (less than 30 people)?
Abstract︰
In social services, if you want to compare the means of scale data (e.g., levels of stress, anxiety, and depression) in a small sample of participants (fewer than 30 people) between two or more groups (e.g., mindfulness vs. exercise) ) is there any significant difference. The Mann-Whitney U test is a nonparametric version of the independent samples t-test (comparing two groups) and the Kruskal-Wallis test is a nonparametric alternative to one-way analysis of variance (ANOVA, comparing multiple groups).
For example, to compare whether there is a difference in age between a boy group and a girl group with small sample data (less than 30 people), the Mann-Whitney U test should be used. If you want to find out whether there are differences in happiness and life satisfaction among boys, girls and mixed groups with small sample data (less than 30 people), you need to use the Kruskal-Wallis test.
Details
 | Website Link （Mann-Whitney U Test） |
| Website Link （Kruskal-Wallis H Test） |
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