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What Is the Duration of the Preoperational Stage of Cognitive

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What is the duration of the preoperational stage of cognitive development


Definitions:

Wilcoxon Rank Sum Test

A non-parametric test used to compare two independent samples to determine whether there is a significant difference between their distributions.

Kruskal-Wallis Test

A non-parametric statistical test that determines if there are statistically significant differences between two or more groups of an independent variable on a continuous or ordinal dependent variable.

Wilcoxon Test Statistic

A non-parametric statistical measure used to compare two paired groups to assess whether their population mean ranks differ.

Level Of Significance

The probability of rejecting the null hypothesis when it is actually true, typically represented by alpha (α).

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