Examlex
The coming of the railroads opened a new era of prosperity for the borderland communities.
Standard Deviation
A statistical measure that quantifies the amount of variation or dispersion of a set of data values from their mean.
Normally Distributed
Describes a distribution that is symmetrical, bell-shaped, and characterized by data equally spread around the mean, implying many measurement observations fall close to the average.
Mean
The average value in a set of numbers calculated by dividing the sum of all values by the number of values.
Z-scores
Standardized scores that indicate the number of standard deviations an element is from the mean.
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