Home / CIE iGCSE Maths C9.5 Scatter diagrams Exam Style Practice Questions- Paper 1

CIE iGCSE Maths C9.5 Scatter diagrams Exam Style Practice Questions- Paper 1

IGCSE Mathematics(0580) Practice Questions Paper 1 - All Chapters

Question

Jill records the temperature and the number of people on a beach for each of ten days. The results are shown in the scatter diagram.

(a) What type of correlation is shown in the scatter diagram?

(b) Describe the relationship between the temperature and the number of people on the beach.

Most-appropriate topic codes (Cambridge IGCSE Mathematics 0580):

• C9.5 Scatter diagrams
▶️ Answer/Explanation
(a) Looking at the data points, as we move from left to right, the points trend upwards together. This upward trend indicates a positive correlation.
(b) A relationship description explains what happens to one variable as the other changes. Since it’s a positive correlation, it means that as the temperature rises, the number of people visiting the beach also increases.
✅ Answer:
(a) positive
(b) the higher the temperature the higher the number of people on the beach (or equivalent)
Question

For each of 10 people working in an office, the scatter diagram shows their salary and the value of their car.

(a) One of these people has a salary of $28,000. Find the value of their car.

(b) Another person starts to work in the office. Their salary is $54,000 and the value of their car is $6,100. Plot this information on the scatter diagram.

(c) What type of correlation is shown in the scatter diagram?

▶️ Answer/Explanation
Solution

Ans:

(a) $4,800 (estimated from the scatter plot)

(b) Point should be plotted at (54,000, 6,100)

(c) Positive correlation (as salary increases, car value tends to increase)

More IGCSE Mathematics Practice Questions Paper 1 ..........
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