CAIE IGCSE Mathematics Core C9.5 Scatter diagrams Question Bank

Practise plotting scatter diagrams, judging correlation and using a ruled line of best fit to describe or estimate relationships.

Syllabus
2028–2030
Topic
C9.5
Level
Core

Exam points

  • plot points from paired data tables and read values from an existing scatter diagram
  • state positive, negative or zero correlation from a diagram or a described relationship
  • draw a ruled line of best fit and use it to estimate an unknown value

Covered syllabus points

C9.5.1 Draw and interpret scatter diagrams.C9.5.2 Understand what is meant by positive, negative and zero correlation.C9.5.3 Draw by eye, interpret and use a straight line of best fit

C9.5 Scatter diagrams question 1

[Maximum number: 5]

Question (a)

(a)

Ten students eat cereal with milk for breakfast.
The amounts are shown in the table.

Table for Question (a) — CAIE IGCSE Mathematics Core
Figure for Question (a) — CAIE IGCSE Mathematics Core
[ 5 ]

Question (i)

(i)

Complete the scatter diagram.

The first six points have been plotted for you.

[ 2 ]

Question (ii)

(ii)

For these students, describe the relationship between the amount of cereal and the amount of milk.

[ 1 ]

Question (iii)

(iii)

On the grid, draw a line of best fit.

[ 1 ]

Question (iv)

(iv)

Another student has 280 ml of milk with her cereal.

Use your line of best fit to estimate an amount of cereal this student has.

___ g

[ 1 ]

C9.5 Scatter diagrams question 2

[Maximum number: 1]
Figure for Question C9.5 Scatter diagrams question 2 — CAIE IGCSE Mathematics Core

The scatter diagram shows the prices of different sized televisions.

Write down the type of correlation shown in the scatter diagram.

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