Bar Graphs Look at the way a bar

Bar Graphs

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?

A bar chart always has a title. Vertical axis (y). Always labelled and numbered. The height of the bars show many of something was scored/recorded. Horizontal axis (x). Always labelled.

What does this bar chart show? Can you read the answers? How many children were surveyed? Favourite Crisps Which is the favourite flavour? 8 7 Number of children 6 Which is the least liked? 5 4 3 What intervals are used on the y axis? 2 1 0 Salt and vinegar Cheese and onion Prawn cocktail Flavours Ready salted Bacon Worcester sauce Barbeque What intervals could you use if twice as many children were surveyed?

Graph 1. 1 V E R T I C A L Types of Bar Graphs

Graph 1. 2 Types of Bar Graphs

Graph 1. 3 Types of Bar Graphs SINGLE BAR GRAPHS

Graph 1. 4 Types of Bar Graphs DO UB LE BA R G RA PH S

The table shows the highway speed limits on interstate roads. within three states State Urban Rural Florida 65 mi/h 70 mi/h Texas 70 mi/h Vermont 55 mi/h 65 mi/h

Step 1 • Choose a scale and interval for the vertical axis. State Urban Rural Florida 65 mi/h 70 mi/h Texas 70 mi/h Vermont 55 mi/h 65 mi/h

• Draw a pair of bars for each state’s data. Use different colors to show urban and rural. Step 2 State Urban Rural Florida Texas 65 mi/h 70 mi/h Vermont 55 mi/h 65 mi/h

Step 3 and 4 Speed Limit on Interstate Roads Urban Speed Limit (mi/h) • Label the axes and give the graph a title. • Make a key to show what each bar represents Rural

Graph 1. 5 Types of Bar Graphs STACKED BAR GRAPHS

How can you collect the information needed to construct a bar chart? By making a tally chart first!

Flavour Salt and vinegar Sour Cream and Onion Ketchup Plain Dill Pickle BBQ Insert any other flavours here Tally

1. Create a Tally Chart with Chip Flavours 2. Go around the class and ask the favourite flavour 3. Construct a Bar Graph with the information 4. Be sure to label your axes correctly and give your graph a title With support