Grouped Tally Chart

A tally chart which records data in groups rather than distinct values. May be used when individual values would have no or little data recorded.

Class

Another way of saying group.

Group

How a set of data may be linked together.

Tally Chart

A table used to record frequencies. Uses tally marks to show frequency. Data is grouped into bundles of 5.

Bar-Line Chart

A diagram that uses lines to represent frequencies. The longer/taller the line the higher the frequency. Only used for discrete data, so equal gaps must be between the lines.

Bar Chart

A diagram that uses bars to represent frequencies. The longer/taller the bar the higher the frequency. Only used for discrete data, so equal gaps must be between the bars.

Key

An important part of any diagram that uses symbols or unusual ways of representing data. Allows the reader to interpret what they are seeing.

Pictogram

A diagram which represents data using symbols.

Value

How much something is worth.

Formula

An algebraic statement with a letter equal to an expression. Used to work out a missing variable by substituting in all other known variables. Plural is formulae.