A LEVEL STATISTICS: Actual June 2025 PAST PAPER 2: Statistical Inference. All
Assessment Questions & Mark Scheme [Edexcel 9ST0/02]
Exam Resource Summary
The June 2025 Edexcel A Level Statistics 9STO/02 – Paper 2: Statistical Inference – Merged
Question Paper & Mark Scheme document combines the official examination paper with its full
mark scheme. This paper assesses students’ understanding of statistical inference, including
hypothesis testing, estimation, confidence intervals, and interpretation of results. The merged
format presents each question alongside its marking criteria, providing clear guidance on examiner
expectations, mark allocation, and question structure. This resource supports focused revision,
development of analytical and problem-solving skills, and practice in applying statistical methods
to real-world data, making it essential for preparation for the June 2025 Edexcel A Level Statistics
Paper 2 examination.
Turn over
, Answer ALL questions. Write your answers in the spaces provided.
1 Since 2006 the RAC, a roadside assistance organisation, have used the RAC Pothole
DO NOT WRITE IN THIS AREA
Index to monitor the state of UK roads.
The Index is a measure of how often, on average, an RAC member requests roadside
assistance for a breakdown where damage from a pothole or other road surface defect
was most likely the cause of the breakdown.
An Index of 1.2 would mean the likelihood of pothole damage had increased by 20%
compared to 2006
A reporter sees that the most recently reported figure was 2.0 and wishes to write an
article about the likelihood of pothole damage, which she claims is now twice as great
as in 2006
[Source: How to report a pothole and claim for damage online | RAC Drive]
(a) Explain why the reporter is correct in her interpretation of the value of 2.0
(1)
DO NOT WRITE IN THIS AREA
For the years 2014 to 2021, the Pothole Index for each quarter was recorded, the
summary statistics are shown below.
x 70.05 x x 6.5596 n 32
2
(b) Test to see whether, on average, this evidence would have supported the reporter’s
claim between 2014 and 2021
(8) DO NOT WRITE IN THIS AREA
2
■■■■
,2 In the game of tennis, players score points in a number of ways.
An ace is a tennis stroke in which a player beginning the point strikes the ball so that
DO NOT WRITE IN THIS AREA
their opponent is unable to make contact with the ball. This wins the point for the player
beginning the point.
Daniil, a TV commentator, believes that the number of aces has begun to decrease over
recent years.
He collected data from a website for the total number of aces for each of the top
10 male professionals for the 2018 and 2023 French Open tournaments.
This is shown in Figure 1
2018 Number of Aces 2023 Number of Aces
12 10
14 19
27 20
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37 27
40 32
44 36
47 42
55 43
57 45
76 50
Figure 1 DO NOT WRITE IN THIS AREA
[Source: Infosys Slam Leaderboard – Roland-Garros – The 2018/23 Roland-Garros Tournament
official site (rolandgarros.com)]
(a) Conduct a suitable distribution free test to investigate Daniil’s belief.
(9)
4
■■■■
, Question 2 continued
(b) Discuss briefly whether you think the results of this hypothesis test could be used
DO NOT WRITE IN THIS AREA
generally for the number of aces in the game of tennis.
Ensure your answer includes two distinct comments.
(2)
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Since 1989, special technology has been used at major tournaments which allows the
speed of a tennis player’s serve to be measured.
A speed of 163.4 mph was recorded for a male tennis player in 2012, and is believed to
be the fastest serve ever.
(c) Give two distinct reasons why this belief may not be true.
(2)
DO NOT WRITE IN THIS AREA
(Total for Question 2 is 13 marks)
6
■■■■
Assessment Questions & Mark Scheme [Edexcel 9ST0/02]
Exam Resource Summary
The June 2025 Edexcel A Level Statistics 9STO/02 – Paper 2: Statistical Inference – Merged
Question Paper & Mark Scheme document combines the official examination paper with its full
mark scheme. This paper assesses students’ understanding of statistical inference, including
hypothesis testing, estimation, confidence intervals, and interpretation of results. The merged
format presents each question alongside its marking criteria, providing clear guidance on examiner
expectations, mark allocation, and question structure. This resource supports focused revision,
development of analytical and problem-solving skills, and practice in applying statistical methods
to real-world data, making it essential for preparation for the June 2025 Edexcel A Level Statistics
Paper 2 examination.
Turn over
, Answer ALL questions. Write your answers in the spaces provided.
1 Since 2006 the RAC, a roadside assistance organisation, have used the RAC Pothole
DO NOT WRITE IN THIS AREA
Index to monitor the state of UK roads.
The Index is a measure of how often, on average, an RAC member requests roadside
assistance for a breakdown where damage from a pothole or other road surface defect
was most likely the cause of the breakdown.
An Index of 1.2 would mean the likelihood of pothole damage had increased by 20%
compared to 2006
A reporter sees that the most recently reported figure was 2.0 and wishes to write an
article about the likelihood of pothole damage, which she claims is now twice as great
as in 2006
[Source: How to report a pothole and claim for damage online | RAC Drive]
(a) Explain why the reporter is correct in her interpretation of the value of 2.0
(1)
DO NOT WRITE IN THIS AREA
For the years 2014 to 2021, the Pothole Index for each quarter was recorded, the
summary statistics are shown below.
x 70.05 x x 6.5596 n 32
2
(b) Test to see whether, on average, this evidence would have supported the reporter’s
claim between 2014 and 2021
(8) DO NOT WRITE IN THIS AREA
2
■■■■
,2 In the game of tennis, players score points in a number of ways.
An ace is a tennis stroke in which a player beginning the point strikes the ball so that
DO NOT WRITE IN THIS AREA
their opponent is unable to make contact with the ball. This wins the point for the player
beginning the point.
Daniil, a TV commentator, believes that the number of aces has begun to decrease over
recent years.
He collected data from a website for the total number of aces for each of the top
10 male professionals for the 2018 and 2023 French Open tournaments.
This is shown in Figure 1
2018 Number of Aces 2023 Number of Aces
12 10
14 19
27 20
DO NOT WRITE IN THIS AREA
37 27
40 32
44 36
47 42
55 43
57 45
76 50
Figure 1 DO NOT WRITE IN THIS AREA
[Source: Infosys Slam Leaderboard – Roland-Garros – The 2018/23 Roland-Garros Tournament
official site (rolandgarros.com)]
(a) Conduct a suitable distribution free test to investigate Daniil’s belief.
(9)
4
■■■■
, Question 2 continued
(b) Discuss briefly whether you think the results of this hypothesis test could be used
DO NOT WRITE IN THIS AREA
generally for the number of aces in the game of tennis.
Ensure your answer includes two distinct comments.
(2)
DO NOT WRITE IN THIS AREA
Since 1989, special technology has been used at major tournaments which allows the
speed of a tennis player’s serve to be measured.
A speed of 163.4 mph was recorded for a male tennis player in 2012, and is believed to
be the fastest serve ever.
(c) Give two distinct reasons why this belief may not be true.
(2)
DO NOT WRITE IN THIS AREA
(Total for Question 2 is 13 marks)
6
■■■■
