Aim: How do we construct a line graph?

Do Now:1. How many inches of

rain fell during the month of June?

2. During which month did the most rain fall?

1. Identify the Variables &2. Label each Axis

• X-axis : independent variable (manipulated variable)*Only one in a valid experimentEx. Days

• Y-axis: dependent variable (measurable)Ex. Height of plant (cm)

3. Determine the Variable Range

• For each variable, subtract the lowest value from the highest value. This number is your range

• Determine the range for both axes

4. Number Each Axis (Scale)

• Divide the range by the number of squares on the axis

• Round to a number that is easy to count by such as 1, 2, 5, 10, 20 etc.

• Each axis must be done separately• Ex. Data: 11, 13, 19, 24, 27, 33

Range: 33-11=22 Squares: 1222/12=1.8, choose to count by 2’s

5. Plot the Data Points

• If you are constructing a double line graph, make sure to plot two data sets & include a key on the graph

6. Draw the Line

• Connect the data points with a line or curve!

7. Title the Graph

• Your graph needs a descriptive title using the following format:Dependent variable vs. Independent variableChild’s Height vs. Child’s Age

8. Interpret the Graph

• Describe the relationship between the independent & the dependent variable*As the independent variable increases, the dependent variable (increases, decreases, is constant)Ex. As the child’s age increases, the child’s height increases

Brainpop Video

• https://www.brainpop.com/math/dataanalysis/graphs/

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