Frequency tables and graphs

Frequency tables and graphs

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Categorical, Discrete and Continuous data

• Categorical variables represent types of data which may be divided into groups

• Discrete data is information that can only take certain values

• Continuous data refers to data that can take any value within a range

• Discrete data and Continuous Data are both numerical data

Column graph

• Also called Bar chart

• Used to represent categorical and discrete data

• Count

Histogram

• Used to represent Continuous data

• Measure

Grouping data and finding class intervals

• Used for a large amount of data and a large range

• A class interval is found by dividing the range into equally sized intervals

• 5 to 10 columns / groups are preferred

Multiple Choice

Select a suitable class interval for this set of data

• 1

• 2

• 3