The level of certainty that the true score falls within a specific range. The smaller the range the less the certainty.
A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean.
Characterized by simple geometric forms in design and decoration
A table in which data values are divided into either a "leaf" or a "stem." In a stem and leaf plot, the stem values appear on the vertical axis and the leaf values are listed on the horizontal axis.