Frequency Distributions Vocabulary

Flashcards for reviewing key vocabulary from the lecture notes on frequency distributions in psychological statistics.

Frequency Distribution Table

A table which shows the data arranged into different classes and the number of cases which fall into each class.

Frequency Distribution Table for Ungrouped Data

An arrangement of data from lowest to highest which shows the frequency occurrence of each value in a set.

Frequency Distribution Table for Grouped Data

An arrangement of data into different classes or categories.

Class Intervals (ci) / Classes

Raw classifiers such as 3 – 8, 9 – 14… 45 – 50.

Lower Limits (LL)

The numbers 3, 9, 15, … 45.

Upper Limits (UL)

The numbers 8, 14, 20, … 50.

Class Size/Class Width (c)

The number of test scores contained in each class, calculated as (UL — LL) + I.

Simple Frequency Distribution Table

Consists only of class interval and frequency.

Complete Frequency Distribution Table

Class mark or midpoint (X), class boundaries (lower boundary lb, and upper boundary ub)

Relative Frequency Distribution Table

A table which lists the relative frequencies of the classes.

Cumulative Frequency Distribution Table

A table which shows the number of cases falling below or above a particular value.

Bar Chart

A graph represented by either a vertical or horizontal rectangles whose bases represents the class intervals and whose heights represents the frequencies.

Frequency Polygon

A line graph whose bases are the class marks and whose heights are the frequencies

Histogram

A graph represented by vertical or horizontal rectangle whose bases are the class mark and whose heights are the frequencies

Pie Chart

A circle graph showing the proportion of each class through either the relative or percentage frequency

Ogive

A line graph where the bases are class boundaries and the heights are the < cf for the less than ogive and > cf for the greater than ogive.