Double Bar and Double Line Graphs - Lesson
Topic Index | Grade 7 Math | Intermediate Test Prep | StudyZone

When collecting, organizing and making sense of raw data, often it is best to make use of bar and line graphs.  If comparing two sets of data we use double bar and double line graphs.

Say, for example, that 25 students were followed from age 14 to age 18 to record how many of these students worked at each age level.  The following is the data that was collected:

14 yrs: 1 worked, 24 did not work
15 yrs: 3 worked, 22 did not work
16 yrs: 11 worked, 14 did not work
17 yrs: 19 worked, 6 did not work
18 yrs: 22 worked, 3 did not work

The next step would be to construct
a graph to read the data more easily.

Let's look at a double bar graph first...

Be sure to:

  • Give the graph a title

  • Label the axes

  • Be consistent with the numbers

  • Use a key

  • Leave a space between the bars as we go to the next age

Now let's construct a double line graph using the same data:

Be sure to:

  • Give the graph a title

  • Label the axes

  • Be consistent with the numbers

  • Use a key

 

Now let's practice!

 

 
Topic Index | Grade 7 Math | Intermediate Test Prep | StudyZone

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