Displaying data
Mathematics, Grade 8
Displaying data
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Displaying data
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Displaying data
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Displaying data
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Study Guide Displaying data Mathematics, Grade 8
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DISPLAYING DATA Displaying data refers to the many ways that data can be displayed whether it is on a bar graph, line graph, circle graph, pictograph, line plot, scatter plot or another way. • When data is displayed on a graph, there are certain rules that apply in order to have the data correctly represented. Certain data is better displayed with different graphs as opposed to other graphs. For example, if data representing the cost of a movie over the past 5 years were to be displayed, a line graph would be best to use because a line graph is used specifically for data that is shown over a period of time. A circle graph would not be appropriate to use because a circle graph represents data that can add up to one or 100%. Once data is displayed on a graph, information can be concluded about the data. How to display data In order to display data correctly on a graph, certain rules must be followed to be sure that the data is correctly represented. With any graph, the vertical axis should always start at zero and the intervals should be spaced equally. • With a bar graph, it is important that the bars used are all the same size. • With a pictograph, all the pictures should be the same size. • With a circle graph, the quantities should add up to one or 100%. For example, with the circle graph shown, the percentage of dogs looks to be about 65%, when actually it should be 54%. The percentages used do not add up to 100%. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
For different types of data, different graphs should be used. • A bar graph is used when data falls into separate categories and the data totals are to be compared. • A line graph is used for data that is shown over a period of time. • A pictograph is used when data needs to be displayed in categories and will give a more visual effect. • A line plot is used to display data that has smaller quantities. • A scatter plot shows a relationship between the data depending on the correlation of the points. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Try This! 1. What type of graph would be best to use to display the number of cars owned? 2. What type of graph would be best to use to display the price of a loaf of bread over the past ten years? 3. What type of graph would be best to use to display the percentage of workers who take no lunch, a 30-minute lunch or an hour lunch? 4. Based on the scatter plot, what can be concluded about the height of a person and their shoe size? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
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