Idea 7of 22Builds onA bar graph compares groups
A double-bar graph compares two groups
How can one graph compare two groups at once?
Today you'll discover
- what the legend tells you
- how the bars are paired
- how to compare the two groups
Think firstGrade 5 and Grade 6 pick a favourite sport
Which sport do Grade 6 students like most?
Decide first, then press Next. Read the legend before the bars.
A double-bar graph of favourite sports: for each sport a plain bar for Grade 5 and a striped bar for Grade 6. Soccer 9 and 6, Basketball 4 and 10, Hockey 7 and 5, with a legend under the title. A bracket in Basketball marks Grade 6's 6 more votes. The last step shows pizza votes from Rooms 12 and 14.
See the whole ideathe big idea and the key word, in one place
The big idea
A double-bar graph puts two groups side by side, and a legend says which is which.
Easy to get wrongRead the legend first. The tallest bar on the graph may belong to the group you were not asked about.
Good forComparing two groups category by category: two grades, two classes, or this year and last year.
Key words
- double-bar graph
- a bar graph with two bars for each category, one for each group
- legend
- the box on a graph that says which colour or pattern stands for which group
Ready to use it?
- Read a double-bar graph with its legend.
- Compare two groups within each category.