1. How to Create Bar and Line Graphs

2. Draw and label the Axis
Y – Axis
X - Axis

3. Identify and label variables
Y – Axis
Dependent
Variable
(what is being
observed)
X - Axis
Independent
(what is being changed by scientist)

4. Helpful Hint: DRY MIX D – Dependent M – Manipulated
R – Responding I – Independent
Y – Y axis X – X axis

5. Scale and Intervals Decide on an appropriate scale
Minimum and maximum numbers used on each axis. May not start with zero
Numbers used should be a little below the lowest value and a little higher than the highest value
Use common and consistent intervals

6. Scale = 0 to 70 Intervals of 10

7. Title and labels
Place an appropriate and descriptive title at the top of your graph
Label the Y and X axis with their variables (X with the independent variable and Y with the dependent variable

8. Bar Graphs
Compare groups by showing relative amounts (totals) or categories

9. Line Graphs
Show relationship between the independent and dependent variable
Used to show trends (change over time) and make predictions

10. Line Graphs can be used to show multiple sets of data

11. Slugs were fed a variety of foods to determine their feeding preferences. Based on the data given, construct the appropriate graph and formulate a conclusion.
Food Source
Food Eaten (grams)
Lettuce
4.0
Mushrooms
8.2
Dog food
0.0
Spinach
6.5
Apple
8.6
Peach
5.4
Orange
1.0

12. Slugs Favorite Food

13. Every ten years scientists counted the number of 3 endangered birds to see if their conservation efforts were working. Review the data table, construct the appropriate graph and formulate a conclusion.
Bird Species
1950
1960
1970
Whooping Crane 24 41 78
California Condor 76 46 20
Black Swan 56 58 57

14. Endangered Bird Populations
Number of Birds
Years