6 Line graphs
Now that you’ve had a look at pie charts and bar charts, let’s take a look at line graphs. These are drawn by marking (or plotting) points and then joining them with a straight line. You might have seen them used in holiday brochures or maybe on the television.
Hint: It is best to use graph or squared paper when drawing line graphs because it makes it easier to plot the points.
Now try the following activity. Remember to check your answers once you have completed the questions.
Activity 10: Creating a line graph
Line graphs are often used in holiday brochures to show temperatures or hours of sunshine at a particular resort.
The following table shows the hours of sunshine at a holiday resort. Draw a line graph using the data from the table and then answer the questions below.
|Month||Hours of sunshine|
- What month was the sunniest?
- What month had the least sunshine?
When drawing your line graph you should:
- draw the horizontal axis, labelling it ‘Months’, and the vertical axis, labelling it ‘Hours of sunshine’
- divide these axes into suitable scales – your smallest and largest numbers are 6 and 9, so your scale could be one square for one hour
- plot the points from your data, using a pencil and make small crosses
- join the points using a ruler
- give your graph a title such as ‘Hours of sunshine at a holiday resort over a six-month period’.
The finished line graph should look something like this:
In answer to the questions:
- August is the sunniest month.
- May is the least sunniest month.
Self-check: always remember the following statements
Before moving on, you need to make sure you are able to collect, organise and show data in the forms of tables, diagrams, charts and graphs. Ask yourself the following questions:
- When I draw tables, diagrams, charts and graphs, is my data displayed clearly so that the information is easy to understand?
- Do I always include titles, scales, labels and keys when they are needed?
If you are not sure about these points, show your work to someone else and ask if they understand the data.
In this section you have learned about how to present data in line graphs.