The level of certainty that the true score falls within a specific range. The smaller the range the less the certainty.
A statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
An area that is approximately central within some larger region
A set of intervals, usually adjacent and of equal width, into which the range of a statistical distribution is divided, each associated with a frequency indicating the number of measurements in that interval.