Comparing Data in a Bar Graph

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How Can a Bar Graph Help You Compare Data?

A bar graph is like a picture that is made up of bars with different lengths. Each bar represents a different category. The length of each bar can tell us how often something happens or show us the number of items we have in each group.

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We set up a bar graph like this. We have our data categories on one side and a number scale alongside the other. We put a label by the numbers to tell us what we are counting. To record the data, count how many times a category appears and draw a bar that reaches to the number.

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Now that the data is in the shape of bars, we can see the information easily. We can answer questions like which weather had the most, or least amount of days. We can also use the bar graphs to help add or subtract the data.

In This Comparing Bar Graph Video

Nari and Gus have collected data about the weather to try to predict what the weather will be like the next day so they can plan a day at the beach. They have recorded the total number of sunny, rainy, and windy days and put them in the bar graph. Will the weather cooperate?

Additional Practice to Show Why Use Bar Graphs to Represent Data

Following the video are exercises and worksheets to continue practicing looking at information on bar graphs and seeing why bar graphs are useful for comparing data.

Transcript Comparing Data in a Bar Graph

" The weather sure has been sunny lately." " Tomorrow, I think we should go to the beach." "Hmmm...I don't think the weather is always the same." "Maybe we can look at some weather data to guess what the weather might be like tomorrow!" We can help Nari and Gus by... "Comparing Data in Bar Graphs ". Data is information that we collect and put into groups based on things it has in common. When we put data on a graph, it makes it easier to see and understand. Here is a BAR GRAPH of weather data that Nari and Gus collected. It's called a bar graph because the data is in the shape of bars! On THIS side, you can see the three types of weather.... sunny, windy, and rainy. Along the bottom, you see numbers one through ten... and the label, 'Days'. The label tells us the numbers are counting how many days had each type of weather. In the center of the graph are the bars that show how many days each type of weather happened. Let's look at the chart to ask and answer questions about the data. We will COMPARE the data by looking at which type of weather had MORE days... and which type had LESS. First, let's see how many days had each type of weather. How many days had sunny weather? Point to the sun on the graph. Now look at the bar and move your finger to find where it stops. The bar stops on the number, eight. This means there were eight days of sunny weather. How many days had windy weather? Find the wind and look at where the bar stops. There were five windy days. How many days had rainy weather? There were seven rainy days. Which type of weather had the most amount of days? Looking at our graph, we look for which bar is the LONGEST. The sun bar is the longest, so there were MORE sunny days than windy and rainy days. Which type of weather had the least amount of days? Looking at our graph, we look for which bar is the SHORTEST. The wind bar is the shortest, so it had the LEAST amount of days. How many more days were sunny than rainy? First, look at the sun AND the rain bars. Then, find the number of days each bar shows the sun bar has eight... and the rain bar has seven. There was ONE more sunny day than rainy ones. Remember, today we learned about comparing data. Data is information that we collect and put into groups based on things it has in common. When we put data on a graph, it makes it easier to see and understand. A bar graph can help us answer questions about data: We can compare information like how many are in each group... and which groups have more... or less. "See, we have more sunny days, so tomorrow will be sunny!"