Reporting Mann-Whitney U Test in SPSS
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How to Run Mann Whitney U Test in SPSS: Explanation Step by Step
From the SPSS menu choose Analyze – Nonparametric tests – 2 independent samples.
A new window will open. From the left box, the dependent variable (math test score) transfer to the box Test Variable List. From the left box, categorical independent variable transfer to Grouping variable box. Click on the Define Groups tab, and a new window will open.
In the new window, we should define groups.
If you do not remember how you coded variable, right-click on the variable in the Grouping Variables box (step 2) and click on Variable information. We coded variable Gender 1 for Male, 2 for female, so we will write 1 for Group 1, and 2 for Group 2. Click Continue.
We will return to the previous window. Click on Options… tab and a new window will open.
In the statistics box, check Descriptive and Quartiles. Click Continue and OK.
The results will appear in the output window.
How to report a Mann Whitney U Test results: Explanation Step by Step
How to Report Descriptive Statistics Table in SPSS Output?
The first table shows descriptive statistics (number of observations, mean, standard deviation, minimum, maximum, percentiles).
How to Report Ranks Table in SPSS Output?
The second table shows Ranks – number of observations in each group (male and female), mean rank, and sum of ranks for the two groups (male and female). The group with higher rank has the highest Math test score.
How to Report P-Value for Mann Whitney U Test in SPSS Output?
The third table shows test Statistics. We used Mann-Whitney U test statistics (53.000) and Asymp. Sig. (2-tailed) to reject or fail to reject the null hypothesis.
If p > 0.05, we fail to reject the null hypothesis.
If p < 0.05, we must reject the null hypothesis.
Since in our example, p = 0.173 > 0.05, we fail to reject the null hypothesis and conclude that there is no difference in the Math test score between males and females.
How to Interpret a Mann Whitney U Test Results in APA Style?
Mann-Whitney U test was conducted to determine whether there is a difference in Math test scores between males and females. The results indicate non-significant difference between groups, [U = 53.00, p = .173]. In conclusion, We fail to reject the null hypothesis and conclude that there is no difference in the Math test score between males and females.
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