Examlex
The single most important principle in the ethics of testing is
Mean
The average of a set of numbers, calculated by dividing the sum of these numbers by the count of the numbers.
Variance
A measure of the dispersion of a set of data points around their mean; it is calculated as the average of the squared differences from the Mean.
Chi-squared Distribution
The Chi-squared distribution is a statistical distribution widely used in inferential statistics, especially in chi-squared tests, described by degrees of freedom.
Degrees of Freedom
The number of independent pieces of information available to estimate another piece of information or parameter.
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