Before revision: Chance factors: luck in selection of answers by sheer guessing, momentary distractions The goal of estimating reliability is to determine how much of the variability in test scores is due to errors in measurement and how much is due to variability in true scores (true value).
After revision: Chance factors: luck in selection of answers by sheer guessing, momentary distractions The goal of estimating reliability is to determine how much of the variability in test scores is due to measurement errors and how much is due to variability in true scores (true value).