Bar Graphs

Take notes on this lesson

​you will have an open notes quiz next week when I return

This quiz will include information on Bar Graphs, Line Graphs, Scatter plot (best fit line) and Pie Charts.
You have a sub all week, so it is up to you to get good notes and get everything done.

Bar Graphs

Bar graphs are used when you are comparing different groups or things.

example: amount of people that like DIFFERENT types of movies

Multiple Choice

What are bar graphs used for?

• Seeing a change over time

• Seeing parts of a whole

• Comparing different groups or things

• determining trends

The title should be SHORT and describe what the viewer is looking at.
See example

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​A Bar Graph must have a Title

Notice in the example, each axis tells us what is measured and in what units.
y axis is temp in Celcius
x axis is time in minutes
(I know its hard to see )

Bar graphs have an X and a Y axis. These Axis must be labeled with what is being measured and the UNITS in which they are being measured.

Multiple Choice

What information is on the X axis?

• Number of students

• Month

• Color of bar

-The axis must also have equal intervals.

-Scales can be counted by 1s, 2s, 3s, 4s, 5s, 10s,.....etc

-You CANNOT skip numbers

-You do not have to start at zero, but you usually do

-Notice in the example, the Y axis starts at zero, counts up by 5s every time, and no numbers are skipped

Multiple Choice

What is being measured on the Y axis?

• Vehicle color

• Frequency of collision

• Number of people

• Cost of collisions

The bars on a Bar graph must be evenly spaced and are frequently colored to tell them easily apart.

And you should always try to number your axis so that you use as much verticle space as possible. (Dont have too much blank space at the top of the Bar Graph)

Multiple Choice

On the Y axis, what is he interval of the numbers?

• 1

• 2

• 0

• 12

Do not forget the following when making a Bar Graph