Objectives Recognise types of data Construct stem and leaf diagrams Understand grouped frequency distributions Construct cumulative frequency polygons

Types of Data Qualitative Quantitative Height Town of birth Height Town of birth Eye colour Age

Types of Data Continuous Discrete Time Volume Height Weight Cost in £’s Number of children Shoe size Number of pets

Stem and Leaf Diagrams means 18

Stem and Leaf Diagrams

Grouped frequency A sample of the number of visits made to the doctor by 150 patients

Class lower class limitupper class limit 4.5 lower class boundary 9.5 upper class boundary class width 7 midpoint