Scatter Diagrams

Example

The table below lists the heights (in cm) and the shoe sizes of 12

people (all female)

Height (cm)

158 160 161 163 164 166 166 167 168 170 171 174

Shoe size

37 36 38 39 37 40 38 37 39 42 41 40

Represent the data on a scatter diagram.

Example

The table below shows the marks obtained by 12 pupils in a

French examination and a History examination.

French 11 59 14 30 41 45 21 49 81 24 35 70

History 73 70 73 60 54 50 68 46 21 65 56 30

Draw a scatter diagram to represent these results and draw on a line

of best fit.

Adam scored 60% in his French exam but was absent for his History

exam. What mark do you estimate for him?

Example

Twelve ‘A’ level students recently took mock examinations in

Maths. Here are their marks for the two papers

a) Draw a scatter diagram to represent these results and draw on a

line of best fit.

b) A student M scored 50 marks on Paper 1 but was absent for paper

2. Use the line of best fit to predict a score for student M on

paper2.

Student A B C D E F G H I J K L

Paper 1 22 25 32 35 40 43 45 49 52 52 59 60

Paper 2 29 36 36 47 44 57 52 62 52 60 65 67

Example

Ashish compared the published price of several children’s books with

the price of the same books in a discount book club catalogue.

Published Price

£10.00 £6.00 £11.00 £15.00 £13.00 £5.00 £10.00

Book Club price

£7.00 £4.50 £8.50 £11.00 £9.00 £4.00 £8.00

a) Represent this information on a scatter diagram

b) Draw on a line of best fit

c) If a book has a published price of £12.50, what is the price of the

same book likely to be in the catalogue?