Presentation on theme: "Bar Graphs Tables, charts and graphs are convenient ways to clearly show your data."— Presentation transcript:
1 Bar GraphsTables, charts and graphs are convenient ways to clearly show your data.
2 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.
3 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?
4 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.
5 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 Crisps8765Number of children4321Salt and vinegarCheese and onionPrawn cocktailReady saltedBaconWorcester sauceBarbequeFlavours
6 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
7 Scale / IntervalsCounting 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.
8 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.
9 On what day did they sell the most chocolate milk? Wednesday
11 Double Bar GraphThe 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