Bar Graphs
Bar Graph or Double Bar
Graph (REVIEW)
• A bar graph uses length of bars to
represent numbers and COMPARE data.
• In some cases, the use of a pair of bars to
compare data is more useful. This kind of
graph is called a double bar graph.
MathisFun.Com- Organizing and Comparing
Data; Math on Call p. 262-313
How do you make a bar graph?
1.
2.
3.
Create a title
Draw an x and y axis (LABEL what each one represents!)
Plot the information given onto the graph
Example: Last week’s temperatures in degrees Fahrenheit were:
Monday- 45
Tuesday- 60
Wednesday- 48
Thursday- 55
Friday- 56
Let’s
make
that
Saturday- 68
into a bar graph.
Sunday- 70
It should look like this:
degrees (Fahrenheit)
Last Week's Temperatures
80
70
60
50
40
30
20
10
0
day of the week
Double Bar Graphs
How do you make a double bar graph?
A double bar graph is used to
compare two things at once using
the same graph. To create a
double bar graph you have to…
1. Create a title
2. Draw an x and y axis
(LABEL what each one
represents!)
3. Make a key to represent
what each of the different
bars stand for
4. Plot the information given
onto the graph
Last week’s temperatures in
degrees Fahrenheit were:
Monday- 45
Tuesday- 60
Wednesday- 48
Thursday- 55
Friday- 56
Saturday- 68
Sunday- 70
Last week’s temperature in
degrees Celsius were
Monday- 7
Tuesday- 16
Wednesday- 9
Thursday- 12
Friday- 13
Saturday- 20
Sunday- 21
temperature (in degrees)
It should look like this:
80
70
60
50
40
30
20
10
0
Fahrenheit
Celsius
day of the week
Based on the graph answer these questions:
1. Which day of the week was the hottest in degrees Fahrenheit?
2. Which day of the week was the coldest in degrees Celsius?
Histograms
Histogram (REVIEW)
• Histograms show how often data falls into
different ranges or intervals.
MathisFun.Com- Organizing and Comparing
Data; Math on Call p. 262-313
Histograms are VERY similar to bar graphs and
double bar graphs but:
• There are NO gaps between the bars in a histogram.
• The x axis is measured in intervals or ranges.
How do you make a histogram?
1. Make a title
2. Draw an x and y axis (LABEL what
each one represents!)
3. Make sure your x axis is in intervals
4. Plot the information given onto the
graph
number of dresses
EXAMPLE:
You asked customers who bought one of the blue dresses how old they
were. The ages were from 5 to 25 years old. You decide to put the
results into groups of 5. Then you put the data you collected onto a
histogram.
Blue Dress Poll
ages