2. Line Graphs A line graph is a way to summarize how two pieces of information are related and how they vary depending on one another. The numbers along a side of the line graph are called the scale

3. Pie Charts A pie chart is a circle graph divided into pieces, each displaying the size of some related piece of information. Pie charts are used to display the sizes of parts that make up some whole

4. The pie chart below shows the ingredients used to make a sausage and mushroom pizza. The fraction of each ingredient by weight is shown in the pie chart below. We see that half of the pizza's weight comes from the crust. The mushrooms make up the smallest amount of the pizza by weight, since the slice corresponding to the mushrooms is smallest. The sum of the parts equals one.

5. Bar Graphs Bar graphs consist of an axis and a series of labeled horizontal or vertical bars that show different values for each bar. The numbers along a side of the bar graph are called the scale.

6. Making Science Graphs and Interpreting Data Scientific Graphs: Most scientific graphs are made as line graphs. There may be times when other types would be appropriate, but they are rare. The lines on scientific graphs are usually drawn either straight or curved. These "smoothed" lines do not have to touch all the data points, but they should at least get close to most of them. They are called best-fit lines. In general, scientific graphs are not drawn in connect-the-dot fashion

7. A line of best fit is a straight line that best represents the data on a scatter plot. This line may pass through some of the points, none of the points, or all of the points.

8. Here are two examples of best-fit graph lines. One is drawn correctly, the other is not.

9. How To Construct a Line Graph On Paper What To Do: #1 Identify the variables How To Do It: Independent variable- * goes on the X axis * controlled by the experiment Dependent variable- *goes on the Y axis *changes with the experiment

10. What To Do How to Do It #2 Determine the range of the data #3 Determine the scale of the graph Subtract the lowest data value from the highest data value Do each variable separately  Choose a value for each square that best fits the range  Use most of the available space

11. What To Do How To Do It #4 Number and label each axis #5 Plot the data points This tells what data the lines on your graph represent Plot each value on the graph with a dot

12. What To Do How To Do It #6 Draw the graph #7 Title the graph Draw a curve or line that best fits the data points Most graphs are not “connect –the- dots” Title clearly tells what the graph is about If there is more than one set of data provide a key to identify the lines