LINE GRAPH By Cassidy Abdalla, Chloe Withers, and Julie Byrne

Definition A type of graph that has points connected by lines to represent how something changes in value over time.

When to Use Line Graphs Line graphs show changes over time and gives your data a better visual so you can see the differences between each point as time changes.

Data You can use a single set or multiple sets of numerical data with an independent and dependent variable.

Example Population is a real life example of how data changes over time.

Data Collection TimeTemperature (◦F) 8:00 AM14 9:00 AM16 10:00 AM18 11:00 AM19 12:00 AM20 1:00 PM21 2:00 PM21 3:00 PM25 4:00 PM21 5:00 PM20 6:00 PM18 7:00 PM17 8:00 PM15

Steps 1. Collect Data (can be anything numerical and over time) 2.Insert data on Excel 3.Highlight data and click “Insert” then “Line” 4.Add axis titles and graph title 5.Make sure your independent variable is on the x-axis and your dependent variable is on the y-axis How to Interpret a Line Graph If you look at the overall graph, you see the line rises and falls. When the line gets higher on the graph, it means the temperature increased. When the line gets lower on the graph, it means the temperature has decreased. To find the exact temperature of a dot, you look to the left and see which number lines up with the dot. To find out the time of each temperature, you look below the dot and see which time lines up.

Problem What is the average temperature from 8 am. to 8 pm? 19 ˚F

Advantages Can read and understand easily Can quickly make Can have multiple values for axis Can have compare multiple sets of data Shows exact values

Disadvantages Not visually attractive Can deceive Only one dimensional Only use with continual data Hard to scale

Links from Research al/data/idb/worldpopgraph.php al/data/idb/worldpopgraph.php