Graphing Guidelines

Graphing Guidelines - Graphing Guidelines Graphing Often...

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Unformatted text preview: Graphing Guidelines Graphing Often the goal of an experiment is to find the Often relationship between two variables. As one variable changes, so does the other. As Graphing is a useful way to visualize and Graphing describe these relationships. Because the use of graphs is so common in Because sciences, it is important for you to know how to construct and interpret graphs. When preparing graphs for this class, keep When Graphing Guidelines Graphing 1. It is done on graph paper. It graph 2. Use the x-axis for the independent variable (the Use x-axis variable changed by the experimenter) and the y-axis for the dependent variable (the variable y-axis being measured). being 3. The scale you select should be easy to work with The easy such as one square represents 1, 2, 5, or 10 or five squares represents a unit of 1, 10, or a multiple of ten (20, 100, 0.1). Never change the change scale along an axis. However, you may use a different scale for each axis. different Graphing Guidelines Graphing 4. Select a scale that uses the greatest Select greatest portion of the paper. Leave enough room to title your axis and graph. to 5. Label what the axes represent by including Label the measurement and its units. For measurement units For example: "Length (cm)" or “Time in seconds” seconds” Graphing Guidelines Graphing 6. For line graphs, plot your points. For Sometimes you will be asked to connect the dots. • Other times you will be asked to draw the line Other of best fit. The line should pass as close as best The possible to each of the points but should not be connected point-to-point. If the relationship appears to be linear, the line of best fit should linear the be a straight line. be Graphing Guidelines Graphing 7. Title the graph. Make sure you describe what is represented on the horizontal and vertical axes. vertical 8. If you are plotting more than one curve on If the same graph, include a legend that legend identifies the curves. Use different colors or different types of lines such as solid or dashed lines between them. dashed Example Graphs Example Practice Graphs Practice Recall that a bar graph is useful for Recall comparing information collected by counting. We are going to use the clothing of students in this classroom to demonstrate how to make a data table and bar graph. We will look at the shirt color of boys and girls in the room. girls Practice Graphs Practice Step 1: Gather Data An easy way to An organize our data is to create a table. Let’s use this table to fill in our data. Color Color # of Boys # of Girls Red Black Grey Blue White Multi Other Practice Graphs Practice Step 2: Create the Graph Independent variable (x-axis): ________ Dependent variable (y-axis): __________ Choose two different colors to use (one to Choose represent boys, one to represent girls). represent Key Features of Bar Graphs Key 1. 2. 3. Title Axis are labeled with units Legend Legend Check your graph to make sure you have these three features Line Graphs Line Recall that line graphs are useful for showing Recall trends. Problem: In an experiment, you check the air temperature at In certain hours of the day. At 8 A.M., the temperature is 27 ○C; at 10 A.M., the temperature C; is 30 ○C; at noon, the temperature is 32 ○C; at 2 C; C; P.M., the temperature is 31○C; and at 4 P.M., the P.M., C; temperature is 30 ○C. Graph the results of your C. experiment. experiment. ...
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