Find the magnitude of the vector. 
Definitions:
T Test
A statistical test used to compare the means of two groups to see if they are significantly different from each other.
Pairs of Observations
Two related data points collected from a study that are analyzed together to understand correlations or differences.
Degrees of Freedom
The number of independent values in a statistical calculation that are free to vary.
Individuals
Distinct or separate entities often considered in the context of a study or statistical analysis.
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