Frequency Distributions for Quantitative Data

The frequency distribution of events is the number of times each event occurred in an experiment or study.

In statistics, an outlier is an observation that is numerically distant from the rest of the data.

A relative frequency is the fraction or proportion of times a value occurs in a data set.

A cumulative frequency distribution displays a running total of all the preceding frequencies in a frequency distribution.

A plot is a graphical technique for representing a data set, usually as a graph showing the relationship between two or more variables.

Distributions can be symmetrical or asymmetrical depending on how the data falls.

A $z$-score is the signed number of standard deviations an observation is above the mean of a distribution.