![Why pie charts? ,[object Object],Rough grazing crops crops Permanent grass Wood land Towns and roads Land use in the UK](https://image.slidesharecdn.com/piechartshistograms-091210020709-phpapp01/85/Pie-Charts-Histograms-1-320.jpg)
![How do we calculate angles? ,[object Object],10 566 students answered blue. 10 566 x 360Âș = 190Âș (to 3 s.f.) 20 000 How do we calculate frequency (number of people) ? Measure the angle with a protractor if you are not given it. 47Âș x 20 000 = 2610 people (to 3 s.f) 360Âș âŠ.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Pie Charts Histograms
- 3. Bar Charts (too easy) A bar chart is a chart where the height of bars represents the frequency. The data is 'discrete' (discontinuous- unlike histograms where the data is continuous) The bars should be separated by small gaps. Frequencyisalwaysonthe y-axis
- 4. Histograms When the data is continuous (time, length, anything numerical) the graph is called a histogram. A histogram with equally spaced bars looks exactly like a bar chart. BUT you can draw histograms with bars of different widths and the area of the bar is whatâs important. Frequency Density is the label for the y-axis. Frequency density = frequency class width âč VeryImportant âŠ
- 5. 5 4 3 frequency density 2 5 ? 0 1 1 6 10 8 9 3 1 2 4 5 7 0 Distance (Miles) Example Question: The table shows the distance walked in kmsby some walkers at Collserollaat the weekend. Draw a histogram for the data. 5 2 5 ïž 1 = 5 4 2 ïž 1 = 2 3 12 ïž 3 = 4 1.25 3 ïž 1 = 3 1. The class widths are unequal so a frequency density column is needed. 5 ïž 4 = 1.25 2. Scale the horizontal axis. 3. Calculate frequency densities and scale the vertical axis.
- 6. 5 Distance Walked by Walkers 4 3 frequency density 2 1 6 10 8 9 3 1 2 4 5 7 0 Distance (Miles) Example Question 2 The table shows the distance walked in kmsby some walkers at Collserollaat the weekend. Draw a histogram for the data. 5 2 4 3 1.25 4.Draw in the bars and title.
- 7. Scattergraphs We use scattergraphswhenwehavetwo sets of data. Eg Are peoplewho are good at maths alsogood at science? Are peoplewho are older, taller? Wehaveone set of valuesonthe x-axis and theotheronthe y-axis
- 8. Practice 1: Look at the following scatter diagrams. Do they have positive or negative correlation and what does that mean? 1a) (b) Next
- 9. 2) The table lists the weights of twelve books and the number of pages in each one. On the grid, draw a scatter graph to show the information in the table. Draw a line of best fit on the graph and then describe the correlation between the number of pages in the book and their weight. How much would you expect a book of 120 pages to weigh?