Objectives

1
Objectives

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

2
Types of Data
Qualitative
Quantitative
Height
Height
Height
Height
Height
Height
Height
Height
Height
Height
Height
Height
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Town of birth
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Eye colour
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
Age
3
Types of Data
Continuous
Discrete
Time
Cost in s
Volume
Number of children
Height
Shoe size
Weight
Number of pets
4
Stem and Leaf Diagrams
35 23 18 25 20 16 22 27 33 41 27 37 17 25 27 29 28
31 32 40
35
23
8
6
7
3
5
0
2
7
7
7
9
8
5
3
7
1
2
1
0
5
Stem and Leaf Diagrams
5.2 6.6 4.3 8.3 5.1 7.5 8.6 7.1 7.8 2.2 6.6 5.8 3.
5 7.5 6.1 3.8 2.5 2.7 8.8 4.8
6
Grouped frequency
A sample of the number of visits made to the
doctor by 150 patients
7
Class 5 - 9
7 midpoint
8
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