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How to Create Bar Graphs

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How to Create Bar Graphs

- Bar graphs are descriptive.
- They compare groups of data such as amounts and categories.
- They help us make generalizations and see differences in the data.

Draw the Axes

- Use a ruler
- Draw ON the blue lines, not floating in the boxes
- Leave enough room at the bottom and side to label each axis
- About 3 boxes

Y

X

Label the Axes

Y

What is observed and measured?

(Dependent Variable)

# of M&Ms

X

Color of M&Ms

What is changed by the scientist? (Independent Variable)

Title

- Write an appropriate title for the graph at the top.
- The title should contain both the independent and dependent variables.
- What you wrote on the X and Y axis

- Ideas for a title??
- Amount of M&Ms in a Fun Size Bag

Scale

- Decide on an appropriate scale for the y axis.
- The scale refers to the min and max numbers used on each axis. They may or may not begin at zero.
- The min and max numbers used for the scale should be a little lower than the lowest value and a little higher than the highest value.
- This allows you to have a smaller range which emphasizes the comparisons/trends in the data.

Scale

- The Y-axis scale is from 0-100.
- The largest value though is only 35.

Scale

- The Y-axis scale is now from 0-40.
- This does a better job emphasizing the comparisons between coins.
- What should our scale be?

Intervals

- Look at your minimum and maximum values you set
- Decide on an appropriate interval for the scale you have chosen.
- The interval is the amount between one value and the next.

- It is highly recommended to use a common number for an interval such as 2, 5, 10, 25, 100, etc.
- Let’s try a few intervals…

- Draw tick marks ON blue line
- Do NOT label every #

- Start 1 box over from the Y-axis
- Each bar must be the same size
- Leave a box or 2 of space between each bar
- Use a ruler to draw each bar (3-4 boxes wide)
- Label the color underneath
- Write values on top of each bar
- Color!

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