- 1. Data from a table can be presented in many ways. There are 6 main types of graphs; ◼ 1. pictograph ◼2. bar graph ◼ 3. double bar graph ◼ 4. circle graph/ pie chart ◼5. line graph ◼6. double line graph
- 2. PICTOGRAPH ◼A pictograph is a simple way of representing data with a picture. 0 1 2 3 dog cat fish rabbit Y axis This tells us the number of pets. X axis. This tells us the type of pets.
- 3. PICTOGRAPH ◼Can you think what the advantages and disadvantages of a pictogram may be? ◼ * Easy to read * simple data ◼ * Quick * limited topics ◼ * All languages * suits smaller numbers
- 4. BAR GRAPH ◼ A bar graph uses columns or blocks to show data values. This type of chart is useful for showing bigger numbers and for making quick comparisons. Y axis – represents the values that change. X axis – represents the category choices, the data that does not change.
- 5. DOUBLE BAR GRAPH ◼ However, if you wanted to know how many boys and how many girls chose each sport, there is more data to wade through....... ◼ Now which is the most popular sport? ◼ It is much harder to spot the answers. Soccer Softball Basketball Other Boys 3 2 5 2 Girls 6 2 1 1
- 6. DOUBLE BAR GRAPH ◼A double bar graph is used to compare sets of data. It groups results for the same category.
- 7. CIRCLE GRAPH/ PIE CHART A pie chart is a circle made from segments. Each segment represents a proportion. NOT that sort of PIE!!!!
- 8. CIRCLE GRAPH/ PIE CHART ◼THIS type of PIE! ◼The proportions of a circle graph are usually shown as a percentage. Class 1 Blue Black Brown Grey Hazel Green This is called a legend – it uses a colour code to show the categories.
- 9. CIRCLE GRAPH/ PIE CHART ◼Circle graphs do not show exact values, but percentages. They are really useful when comparing a large sample with a small sample. ◼ It would be difficult, as a bar chart, to compare class eye colour with a top value of 30 children to a whole school survey, where there will be over 200 answers.
- 10. Line Graph ◼A line graph is used when the value being measured is the same. It is similar to a bar graph, but samples data at intervals. Line graphs can track when values are high or low. One example is a weather chart, showing the sunshine or rainfall for the year. Each month would be an interval measure. Businesses uses line graphs to track their sales.
- 11. Graphs ◼Each graph type has its own advantages and disadvantages. You need to think about your purpose and audience before choosing which style to use. Can you remember the main types of graphs?