Chapter 35 Presentation of Data

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

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)

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

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

Stem & Leaf Diagrams Example Example The time taken for 20 students to complete a puzzle are: Draw a stem & leaf diagram for this information

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. Maths English