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Frequency Distribution
A tabulation of the number of occurrences of each score value. An organized tabulation of scores or categories and the number of times they appear in a given population or sample.

Relative Frequency
The proportion of observations in the distribution at that score value. The number of occurrences of a particular score value in relationship to the total score value.

Relative Frequency Distribution
A listing of the relative frequencies of each score value.

Cumulative Frequency Distribution
A tabulation of the frequency of all measurements at or smaller than a given score value. Used to help calculate percentiles.

Cumulative Relative Frequency Distribution
A tabulation of the relative frequencies of all measurements at or below a given score value. This is used to directly calculate percentile ranks.

Class Interval
A range of score values. A group of score values that is used to help summarize data that contains many different score values.

Grouped Frequency Distribution
A tabulation of the number of measurements in each class interval or the number of occurrences of scores that fall in each class interval.

Abscissa
xaxis or the horizontal line. Often marked in units of the variable being measured.

Ordinate
yaxis or vertical line. Often marked in units of frequency or relative frequency.

Relative Frequency Histogram
A type of frequency distribution graph that uses the heights of bars to represent relative frequencies of score values or class intervals.

Discrete variable
A type of variable in which no values can exist between two adjacent scores or values.

Continuous variable
A type of variable in which an infinite number of values can exist between any two scores.

Symmetrical Distribution
A type of distribution where if it is divided in half, the two halves are mirror images of each other.

Positively skewed distribution
A type of distribution in which the tail of the graph points towards the right hand side or the side with the higher scores.

Negatively skewed distributions
A type of distribution in which the tail of the graph points to the left hand side or the side with the lower values of a score.

Unimodal, Bimodal, Multimodal Distributions
Distribution with one peak or mode. Distribution with two peaks or modes. Distribution with more than two peaks or modes.

Central Tendency of a Distribution
A score value near the center of the distribution; it is supposed to be a typical or representative score value. Often measured as the mean, median, or mode.

Variability
The degree to which the measurements in a distribution differ from one another. A measurement of how clustered or scattered the scores are in a given distribution.

Percentile Rank
The percent of measurements in the distributions below that score value.

Percentiles
The score value with P% of the measurements in the distribution. Not sure if this refers to the actual score or the percentage still.

