# Mann-Whitney test

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## Mann-Whitney test

A statistical test of the probability that two independent sets of observations come from the same population. The Mann-Whitney test is independent of distribution and can be used when the t test is inappropriate.

## Mann,

Henry Berthold, U.S. mathematician, 1905–.
Mann-Whitney test - rank sum test.

## Whitney,

Donald Ransom, U.S. statistician, 1915–.
Mann-Whitney test - see under Mann, Henry Berthold
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The Mann-Whitney U test was calculated for the scores of CBCL in sleep problems of children with unintentional poisoning and without poisoning.
There was no significant difference of the mean diameter of pellets between both pellets (knee: 825 [micro]m versus hip: 800 [micro]m, P = 0.82, Mann-Whitney U test).
Parameter ART naive Median ([dagger]) CD4 concentration 166 cells/[micro]L (6-609) Median IL-6 concentration 6.8 pg/mL (1.2-316) Median IL-10 concentration 10.1 pg/mL (2.1-870) Parameter ART experienced Median ([dagger]) CD4 concentration 463 cells/[micro]L (37-1519) Median IL-6 concentration 1.4 pg/mL (1.0-27.5) Median IL-10 concentration 6.0 pg/mL (3.0-39.9) Parameter p value * Median ([dagger]) CD4 concentration <0.001 Median IL-6 concentration <0.001 Median IL-10 concentration 0.14 * [alpha] < 0.05, Mann-Whitney U test. ([dagger]) Median (range).
According to the Mann-Whitney U Test results, there is no significant difference between the fluent writing levels of the pupils in terms of reading daily newspapers (U=626,000, p>.05).
According to the results of the Mann-Whitney U test which aimed to test the attendees' self esteem levels in tandem with their gender [Z(472)= 1,80; p>0.05], marital status [Z(472)= 1,77; p>0.05], parental status [Z(472)= 1,78; p>0.05]; there was no statistically meaningful correlation between male and female or single or married attendants, or those who had children or not.
Further post hoc analysis revealed that mothers used more sound effects with 18-month-old children than with 24-month-old children (Mann-Whitney U test = 61.00, z = -2.68, p =.02, r =.47) and 30-month-old children (Mann-Whitney U test = 39.00, z = -3.91, p =.01, r =.65).
However, pair-wise comparisons showed changes of marginal significance in aggregation between WB and PRP (P = .05; Mann-Whitney U test) and between WB and PC (P = .05; Mann-Whitney U test); no significant difference was found between PRP and PC aggregability (P = .13; Mann-Whitney U test).
As shown in Table 1, according to researcher students, the mean score of research activity obstacles is 3.13 [+ or -] 0.95 and 3.33 [+ or -] 0.75 according to non-researchers, which was not significant based on the Mann-Whitney U test.
Mean total serum IgE level was significantly elevated in patients sensitized to both perennial allergens and spring pollens, as compared to patients sensitized only to spring pollens (P < 0.0001, Mann-Whitney U test) (Figure 2(a)).
There were no significant differences, neither in abundance (Mann-Whitney U test = 8.0, p = 1.0), nor in species richness (Mann-Whitney U test = 7.0, p = 0.77) captured by different pitfall trap designs, even when compared separately the two types of trap belonging to each study site (RCSS: Mann-Whitney U test = 0.0, p = 0.12; RFESM: Mann-Whitney U test = 0.0, p = 0.12).
Given the Mann-Whitney U test as the average, (Sequence Average = 190.23, 188.09) it was seen that the risk average of the married players though a bit, was higher than that of the risk average of the single players (Table 4).

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