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Bar Graphs Tables, charts and graphs are convenient ways to clearly show your data.

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The cafeteria wanted to collect data on how much milk was sold in 1 week. The table below shows the results. We are going to take this data and display it in graphs.

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**Look at the way a bar chart is constructed**

Look at the way a bar chart is constructed. Can you name its different parts? What goes here? What is this called? What is this? What do we call this?

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**A bar chart always has a title.**

Vertical axis (y). Always labelled and numbered. The height of the bars show how many of something was scored/recorded. Horizontal axis (x). Always labelled.

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**Can you read the answers?**

What does this bar chart show? How many children were surveyed? Which is the favourite flavour? Which is the least liked? What intervals are used on the y axis? What intervals could you use if twice as many children were surveyed? Can you read the answers? Favourite Crisps 8 7 6 5 Number of children 4 3 2 1 Salt and vinegar Cheese and onion Prawn cocktail Ready salted Bacon Worcester sauce Barbeque Flavours

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**Bar Graph The purpose of a bar graph is to display and compare data.**

Bar graphs use bars to show the data. A bar graph must include: - a title - labeled X and Y axes - equal intervals are used on the Y axis - the bars are evenly spaced apart from each other

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Scale / Intervals Counting by a number is the scale of a graph. Scales can be counting by 2’s, 3’s,4’s, 5’s 10’s … Intervals should be equal. Like 100, 200, 300 units.

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**Bar Graph A bar graph is used to show relationships between groups.**

The two items being compared do not need to affect each other. It's a fast way to show big differences. Notice how easy it is to read a bar graph.

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**On what day did they sell the most chocolate milk?**

Wednesday

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Name that graph

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Double Bar Graph The purpose of a double bar graph is to compare two or more sets of data. Uses bars to show the data. Double bar graphs must include: - Title - Labeled X and Y axes - Equal intervals are used on the Y axis - Pairs of bars are equally spaced, but the compared bars are not - Key

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