Examlex
Which of the following statements about early colonial life in the Chesapeake region is true?
Standard Deviation
An indicator of the degree of variability or spread within a dataset, reflecting the extent to which the data points diverge from the average value.
Variance
An index of variability in a set of data, established by taking the average squared deviation from the mean.
Tchebysheff's Theorem
A theorem that states for any real numbers k > 1, at least (1-1/k^2) of the data values fall within k standard deviations of the mean for any distribution.
Empirical Rule
A statistical rule stating that for a normally distributed dataset, about 68% of values fall within one standard deviation, 95% within two, and 99.7% within three standard deviations from the mean.
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