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# Handling data 1

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Data types and displaying data: pictogram, pie chart and stem and leaf diagrams

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### Handling data 1

1. 1. Handling data 1 BTEOTSSSBAT: Identify quantitative and qualitative data Display data using bar charts, pie charts and stem and leaf diagrams
2. 2. Key words Discrete Continuous Stem and leaf diagram data pictogram pie chart bar chart tally frequency
3. 3. Types of data Statistics is a branch of mathematics that is concerned with the collection and interpretation of data. There are different types of data: Data
4. 4. Types of data Statistics is a branch of mathematics that is concerned with the collection and interpretation of data. There are different types of data: Data QuantitativeQualitative
5. 5. Types of data Statistics is a branch of mathematics that is concerned with the collection and interpretation of data. There are different types of data: Data QuantitativeQualitative Continuous ‘measured’ Discrete ‘counted’
6. 6. Now try these 1 State whether each of the following is qualitative or quantitative data. If quantitative, state whether it is discrete or continuous. (a) The number of pupils in a class. (b) The colour of cars in a car park. (c) The time spent by a motorist waiting at a red traffic light. (d) The styles of women’s dresses available in a chain store. (e) The number of votes received by the candidates in an election. (f) The club of each of the members of the England football team. (g) The number of players from a club who play football for England. (h) The mass of a new born baby. (i) The number of words on a page of a book. (j) The duration of a hockey match.
7. 7. Collecting data Name Transport Time (mins) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
8. 8. Transport Tally Frequency
9. 9. Pictogram A pictogram is a very simple-to-read way of presenting data. It is cheerful and it makes a powerful visual impact.
10. 10. Bar Chart The bar chart is easier to draw than a pictogram and allows for greater accuracy. It is best drawn on graph paper. 0 2 4 6 8 10 12 14 16 Frequency Shirt Colour
11. 11. How to draw pie charts Step 1 Put the information in a table
12. 12. Eye colour No of people Blue 5 Green 2 Hazel 2 Grey 1 Total 10 How to draw pie charts Step 1 Put the information in a table
13. 13. Eye colour No of people Blue 5 Green 2 Hazel 2 Grey 1 Total 10 How to draw pie charts Step 1 Put the information in a table Step 2 Work out how many degrees for one item 360º represent 10 people So 360º ÷ 10 = 36º 36º represent 1 person
14. 14. Eye colour No of people Blue 5 Green 2 Hazel 2 Grey 1 Total 10 How to draw pie charts Step 1 Put the information in a table Step 2 Work out how many degrees for one item 360º represent 10 people So 360º ÷ 10 = 36º 36º represent 1 person No of degrees 5 x 36º = 180º 2 x 36º = 72º 2 x 36º = 72º 1 x 36º = 36º 360º Step 3 Write down in the table how many degrees for each item.
15. 15. How to draw pie charts Step 5 Draw a circle and draw on the correct angles
16. 16. How to draw pie charts Step 5 Draw a circle and draw on the correct angles Step 6 Label the segments Grey eyes Blue eyes Green eyes Hazel eyes
17. 17. Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
18. 18. 10 2 20 3 30 4 5 7 40 50 5 6 7 60 8 8 We can display this on a stem and leaf diagram. LeavesStem Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
19. 19. 1 2 2 3 3 4 5 7 4 5 5 6 7 6 8 8 Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
20. 20. 1 2 2 3 3 4 5 7 4 5 5 6 7 6 8 8 L = 12 lowest Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
21. 21. 1 2 2 3 3 4 5 7 4 5 5 6 7 6 8 8 L = 12 H = 68 Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
22. 22. 1 2 2 3 3 4 5 7 4 5 5 6 7 6 8 8 n = 12 L = 12 H = 71 Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68
23. 23. 1 2 2 3 3 4 5 7 4 5 5 6 7 6 8 8 3 3 represents 33 marks n = 12 L = 12 H = 71 A key Stem and leaf diagrams Stem and leaf diagrams are also known as stemplots. They are useful ways of displaying information. Example These are the results for a module test for 10 students: 12 23 34 35 37 55 56 57 68 68