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In Unified Modeling Language (UML)primary Keys May Be Blank

question 21

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In Unified Modeling Language (UML)primary keys may be blank.


Definitions:

Wilcoxon Signed Rank Test

A nonparametric test used to compare two paired groups to determine if their mean ranks differ.

Z-Statistic

A statistical measure that indicates how many standard deviations an element is from the mean of a distribution.

Rejection Region

The range of values for which the null hypothesis is rejected in hypothesis testing, indicating statistical significance.

Significance Level

A statistical term that determines the threshold at which a null hypothesis is rejected.

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