Pie charts, unlike bar graphs, show dependent data. Without knowing anything more about this business, you might be concerned about the way that sales appeared to have dropped over the year. Quarter 2 was next, with around 25% of sales. Here is a summary of 'some data' in a data table:Īnd the same data displayed in a bar chart:įrom the pie chart you can see immediately that sales in Quarter 1 were much bigger than all the others: more than 50% of total annual sales. The categories need to be independent, that is changes in one of them do not affect the others. This means that you can compare numbers between different categories. Usually the axes of a graph are labelled to indicate the type of data they show.īeware of graphs where the y-axis doesn't start at 0, as they may be trying to fool you about the data shown (and there is more about this on our page, Everyday Mathematics).īar graphs generally have categories on the x-axis, and numbers on the y-axis (but these are interchangeable). The numbers on the y-axis generally, but not always, start at 0 in the bottom left of the graph, and move upwards. The y-axis usually contains numbers, again starting from the bottom left of the graph.You read it from the bottom left of the graph. The x-axis may contain categories or numbers.The line along the bottom is called the horizontal or x-axis, and the line up the side is called the vertical or y-axis. Graphs have two axes, the lines that run across the bottom and up the side. These are widely used in mathematics, and particularly in algebra. They are used when you have data that are connected, and to show trends, for example, average night-time temperature in each month of the year.Ĭartesian graphs have numbers on both axes, which therefore allow you to show how changes in one thing affect another. Line graphs show you how numbers have changed over time. You might, for example, want to show how a budget had been spent on different items in a particular year. Pie charts to show you how a whole is divided into different parts. Example data might include things like the number of people who preferred each of Chinese takeaways, Indian takeaways and fish and chips. They are generally used for, and are best for, quite different things.īar graphs to show numbers that are independent of each other. The four most common are probably line graphs, bar graphs and histograms, pie charts, and Cartesian graphs. There are several different types of charts and graphs. By ‘good’, we mean ones that show what you want them to show, and don’t mislead the reader. This page sets out some of the basics behind drawing and creating good graphs and charts. But how do you choose which style of graph to use? But what about a graph or chart?Ī good graph or chart can show as much as several paragraphs of words. Understanding Statistical DistributionsĪ picture, so they say, will tell a thousand words.Area, Surface Area and Volume Reference Sheet.Simple Transformations of 2-Dimensional Shapes.Polar, Cylindrical and Spherical Coordinates.Introduction to Cartesian Coordinate Systems.Introduction to Geometry: Points, Lines and Planes.Percentage Change | Increase and Decrease.Mental Arithmetic – Basic Mental Maths Hacks.Ordering Mathematical Operations - BODMAS.Common Mathematical Symbols and Terminology.Special Numbers and Mathematical Concepts.How Good Are Your Numeracy Skills? Numeracy Quiz.
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