Formulas & Definitions are in alphabetical order
Formulas & Definitions are in alphabetical order
Empirical Rule ~ aka 65-95-99.7 Rule
When the bulk of the data clusters around the mean in a normal distribution (or bell-shaped curve), the standard deviation can be used to approximate how much of the data will cluster around the mean.
-65% of the data values will fall within 1 standard deviation from the mean
-95% of the data values will fall within 2 standard deviations from the mean
-99.7% of the data values will fall within 3 standard deviations from the mean
The result of multiplying a series of descending natural numbers; useful in computing the number of combinations or permutations between
The average of a sample
The midpoint of a ranked dataset
The midpoint is the midrange between the highest and lowest data points.
Most frequently occurring value of x
The mean of the squared deviations (using the degrees of freedom as the denominator) in a sample
Standardized measurement of dispersion or variation around the mean
Standard Deviation of a Sample
The positive square root of the variance in a sample