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________ may be defined as the relatively permanent, homogeneous divisions in a society into which people sharing similar values, interests, and behavior can be grouped.
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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