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 experiment Ex. 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=22Squares: 12 22/12=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 variable Child’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 s/graphs/ s/graphs/

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