Results
Independent Samples T-Test
The output below tells us that U = 9, and the effect size is rrb = -0.81. This represents a very strong effect: looking at the mean ranks in the output above, we can see that life satisfaction was higher in those who had cats for a pet. We could report something like (note that I’ve quoted the mean ranks from the Descriptives table):
People who had a cat as a pet (mean R = 15.38) reported significantly higher life satisfaction that those whose pet was a fish (mean R = 7.25), U = 9, p = .003, rrb = −0.81 (95% CI [-0.93, -0.54]).
| 95% CI for Rank-Biserial Correlation | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U | df | p | Rank-Biserial Correlation | SE Rank-Biserial Correlation | Lower | Upper | |||||||||
| life_satisfaction | 9.000 | 0.003 | -0.813 | 0.264 | -0.931 | -0.541 | |||||||||
| Note. For the Mann-Whitney test, effect size is given by the rank biserial correlation. | |||||||||||||||
| Note. Mann-Whitney U test. | |||||||||||||||
Descriptives
| Group | N | Mean | SD | SE | Coefficient of variation | Mean Rank | Sum Rank | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| life_satisfaction | Fish | 12 | 38.167 | 15.509 | 4.477 | 0.406 | 7.250 | 87.000 | |||||||||
| Cat | 8 | 60.125 | 11.103 | 3.925 | 0.185 | 15.375 | 123.000 | ||||||||||
Raincloud Plots
life_satisfaction
