1. Chapter 35 Presentation of Data

2. Learning Objectives Read a bar chart Read a bar chart Read a bar-line graph Read a bar-line graph Draw a bar chart Draw a bar chart Draw a bar-line graph Draw a bar-line graph Compare data using bar charts Compare data using bar charts Read a pie-chart Read a pie-chart Draw a pie-chart Draw a pie-chart Read a stem & leaf diagram Read a stem & leaf diagram Draw a stem & leaf diagram Draw a stem & leaf diagram Read a back to back stem and leaf diagram Read a back to back stem and leaf diagram Draw a back to back stem and leaf diagram Draw a back to back stem and leaf diagram

3. Bar Charts Gaps if no groups Gaps if no groups No gaps if group No gaps if group Bars the same width Bars the same width Modal value/group is the value/group with the highest bar Modal value/group is the value/group with the highest bar Bar-line graph is the same as a bar chart only it has lines instead of bars Bar-line graph is the same as a bar chart only it has lines instead of bars Range = biggest – smallest (on horizontal) Range = biggest – smallest (on horizontal)

4. Drawing a Pie-Chart Find total Find total Divide each number by total Divide each number by total Multiply by 360 o Multiply by 360 o Method of Cooking Number of Children WorkingDegrees PoachedBoiledScrambledFried58611

5. Reading a Pie-Chart Degrees in section ÷ 360 o × total Degrees in section ÷ 360 o × total USA EU Canada Russia Members of an International Committee The USA has 12 committee members. How many committee members do the others have? USA

6. Stem & Leaf Diagrams Example Example The time taken for 20 students to complete a puzzle are: 15 9 23 32 17 12 27 19 26 15 20 11 24 31 10 17 15 28 33 18 Draw a stem & leaf diagram for this information

7. Back to Back Stem & Leaf Example The results for Maths and English tests are shown. Draw a back to back stem & leaf diagram to illustrate this and comment on the results. Maths91 27 55 69 83 25 45 53 67 71 30 52 45 59 86 73 65 47 54 38 English45 40 48 65 75 55 36 85 76 69 64 58 47 64 67 72 83 74 62 51