Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Wednesday 17 June 2026
Afternoon (Time: 2 hours) Paper
reference 9ST0/03
Statistics
Advanced
PAPER 3: Statistics in Practice
You must have : Total Marks
Statistical formulae and tables booklet
Calculator
Candidates may use any calculator allowed by Pearson regulations.
Calculators must not have retrievable mathematical formulae stored in them.
Instructions
•• Use black ink or ball‑point pen.
• Fill
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
in the boxes at the top of this page with your name,
• Answer
centre number and candidate number.
all questions and ensure that your answers to parts of questions are
• Answer
clearly labelled.
the questions in the spaces provided
• You
– there may be more space than you need.
should show sufficient working to make your methods clear.
•• Unless
Answers without working may not gain full credit.
otherwise stated, inexact answers should be given to three significant figures.
Unless otherwise stated, statistical tests should be carried out at the
5% significance level.
Information
•• AThere
booklet ‘Statistical formulae and tables’ is provided.
• The
are 6 questions in this question paper. The total mark for this paper is 80.
marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
Advice
•• Read each question carefully before you start to answer it.
•• Check
Try to answer every question.
your answers if you have time at the end.
If you change your mind about an answer, cross it out and put your new answer
and any working underneath.
Turn over
P79565A
©2026 Pearson Education Ltd.
P:1/1/1/1/1/1/
*P79565A0120*
, Answer ALL questions. Write your answers in the spaces provided.
1 Charlie works in the Quality Control department of a large chocolate factory. He
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
regularly checks the proportion of the 9 different types of chocolate placed in variety
boxes. Charlie samples eight boxes and counts how many chocolates there are of each
type. The results for his samples are shown in Figure 1
Chocolate Egg Truffle Milky Decker
Secret Crispie Bliss Dreamy Swirl
type Surprise Treat Delight Triple
Frequency 49 50 50 52 56 57 61 62 27
Figure 1
(a) Use a χ2 test to determine whether there is evidence that the chocolates appear in the
same proportion to each other.
(8)
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2
*P79565A0220*
, Question 1 continued
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DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
_____________________________________________________________________________________
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Charlie suggests that adjustments need to be made to ensure an equal proportion of
chocolates in each box.
(b) Use the contributions to the test statistic in (a) to suggest which type of chocolate
needs the most adjustment and give a recommendation about the adjustment to be
made. Give a reason for your answer.
(2)
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_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
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(c) Give one assumption that needs to be made about the boxes of chocolates chosen
for this hypothesis test.
You should explain whether you believe the assumption is valid or not.
(2)
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_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
(Total for Question 1 is 12 marks)
3
*P79565A0320* Turn over
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Wednesday 17 June 2026
Afternoon (Time: 2 hours) Paper
reference 9ST0/03
Statistics
Advanced
PAPER 3: Statistics in Practice
You must have : Total Marks
Statistical formulae and tables booklet
Calculator
Candidates may use any calculator allowed by Pearson regulations.
Calculators must not have retrievable mathematical formulae stored in them.
Instructions
•• Use black ink or ball‑point pen.
• Fill
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
in the boxes at the top of this page with your name,
• Answer
centre number and candidate number.
all questions and ensure that your answers to parts of questions are
• Answer
clearly labelled.
the questions in the spaces provided
• You
– there may be more space than you need.
should show sufficient working to make your methods clear.
•• Unless
Answers without working may not gain full credit.
otherwise stated, inexact answers should be given to three significant figures.
Unless otherwise stated, statistical tests should be carried out at the
5% significance level.
Information
•• AThere
booklet ‘Statistical formulae and tables’ is provided.
• The
are 6 questions in this question paper. The total mark for this paper is 80.
marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
Advice
•• Read each question carefully before you start to answer it.
•• Check
Try to answer every question.
your answers if you have time at the end.
If you change your mind about an answer, cross it out and put your new answer
and any working underneath.
Turn over
P79565A
©2026 Pearson Education Ltd.
P:1/1/1/1/1/1/
*P79565A0120*
, Answer ALL questions. Write your answers in the spaces provided.
1 Charlie works in the Quality Control department of a large chocolate factory. He
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
regularly checks the proportion of the 9 different types of chocolate placed in variety
boxes. Charlie samples eight boxes and counts how many chocolates there are of each
type. The results for his samples are shown in Figure 1
Chocolate Egg Truffle Milky Decker
Secret Crispie Bliss Dreamy Swirl
type Surprise Treat Delight Triple
Frequency 49 50 50 52 56 57 61 62 27
Figure 1
(a) Use a χ2 test to determine whether there is evidence that the chocolates appear in the
same proportion to each other.
(8)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
2
*P79565A0220*
, Question 1 continued
_____________________________________________________________________________________
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
Charlie suggests that adjustments need to be made to ensure an equal proportion of
chocolates in each box.
(b) Use the contributions to the test statistic in (a) to suggest which type of chocolate
needs the most adjustment and give a recommendation about the adjustment to be
made. Give a reason for your answer.
(2)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
(c) Give one assumption that needs to be made about the boxes of chocolates chosen
for this hypothesis test.
You should explain whether you believe the assumption is valid or not.
(2)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
(Total for Question 1 is 12 marks)
3
*P79565A0320* Turn over
