Section 3: Graphing

An important part of every experiment is recording observations and organizing data in easy-to-read tables and/or graphs.  A graph is a visual display of information or data.

A line graph shows trends or how data changes over time.  How many hot dogs were sold on Thursday?

A bar graph is useful for comparing information collected by counting.  How many people total thought grapes and bananas were the nicest fruits?

A circle graph is used to show how a fixed quantity is broken down into parts.  What percentage of people’s favorite type of movie is drama?




  1. What is a graph?
  2. What type of graph is best for displaying how data has changed over time?
  3. Identify the three types of graphs.

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