Statistics

A variable is a quantity

A variable is a quantity that can vary from one individual to another. There are two main types: (1) Continuous variables - can take any numerical val

Frequency is the number of times

Frequency is the number of times a particular data value appears in a dataset. A frequency distribution is a tabular arrangement showing data values w

Class intervals are ranges of values

Class intervals are ranges of values used to group data. Each interval has a lower class limit (smallest value) and upper class limit (largest value).

There are two types

There are two types: (1) Inclusive distribution - upper limit of one class doesn't coincide with lower limit of next class (e.g., 1-10, 11-20), (2) Ex

Cumulative frequency of a class

Cumulative frequency of a class is the sum of frequencies of all classes up to and including that class. It can be presented as 'less than' cumulative