Line Graph Notes

What can we use a graph for? Warm Up 10/9 What can we use a graph for? (What type of information can graphs tell us…give some examples!)

Check your homework Correct your graph as we look over the homework together.

Fill in the blanks and examples as we go through the notes together. Graphing Notes HD#19 Fill in the blanks and examples as we go through the notes together.

1. Title Write a title that explains your graph. Be sure it includes both the independent and dependent variables. Example: The effect of light (independent variable) on plant height (dependent variable)

2. Axes DRY = Dependent/Responding -Y axis Draw the Axes: X and Y Y axis is the dependent variable X axis is the independent variable DRY = Dependent/Responding -Y axis MIX = Manipulated/Independent - X axis

Axes

3. Labels Both axes need to be labeled so the reader knows exactly what the independent and dependent variables are. The dependent variable must be specific and include the units used to measure the data (such as “number of drops” cm, grams, etc.).

On which day did the driver travel the least amount of miles?

4. Key Make sure to include a key if you have more than one set of data. A key shows what each line represents. You can use colors, symbols, shading, or dotted lines to show the difference between different data sets on a key.

5. Scale Decide on an appropriate scale for each axis. The scale refers to the minimum and maximum numbers on each axis. They may or may not begin at zero. The min and max numbers for the scale should be a little lower than the lowest value in the data and a little higher than the highest value in the data. This provides you with a larger frame to examine the graph. Once you have your highest and lowest numbers on the axes, evenly space out the intervals in between using a common number: 1, 2, 5, 10, 25, 100, etc.

Do these graphs have the same data Do these graphs have the same data? Which is better for analyzing the data?

6. T.A.L.K.S. Title, Axis, Labels, Key, Scale A handy acronym to help you remember everything you need to create your graphs…. Title: Includes both variables Axis: IV on X-axis and DV on Y-axis Label: Both axes are labeled. Key: Identifies the data sets Scale: Min and max values are appropriate.

7. Line Graphs Line graphs show a relationship between the two variables. They show how/if the IV affects the DV. Many times the IV plotted on the Xaxis is time (Line over Time) They are useful for showing trends in data and for making predictions.

Let’s Try Some Practice! Complete the four graphs. Be careful about the scale you need to use to complete your graph.

Exit Slip 3- Questions you still have about graphing 2- Things you learned about graphing 1- Thing you’ll remember about graphing