Double Bar Graphs

Double Bar Graphs

What are they and how are they useful?

What is a double bar graph?

A double bar graph is like a single bar graph except for it has multiple bars for each category. These different bars for each category are usually different colours or patterns. A legend or key is used to show what each colour or pattern mean.

What information can you tell from this double bar graph?

Favourite Sports

Amanda gave the students of her class a survey to determine their favourite sport. She decided to split the results into boy’s and girl’s. She created a bar graph to display the results of her survey.

Poll

From Amanda's bar graph, can we tell how many boys and girls like each sport?

• yes

• no

No, we can't tell how many boys and girls like each sport from Amanda's bar graph.

What can Amanda do to make the graph show the results for girl's and boy's responses to her survey question?

Amanda can create a Double Bar Graph!

A double bar graph of her data clearly shows the favourite sport of the boys and girls in her class.

Let's Analyse the Data

• How many students were surveyed all together?

• Which sport was the favourite of most girls?

• Which sport was the favourite of most boys?

• How many more girls liked tennis than boys?