Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel
Level 3 GCE
Time 2 hours
Paper
reference 9ST0/02
Statistics
Advanced
PAPER 2: Statistical Inference
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,
• clearly
centre number and candidate number.
Answer all questions and ensure that your answers to parts of questions are
• Answer
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
• Unless
significant figures.
otherwise stated, statistical tests should be carried out at the
5% significance level.
Information
•• AThere
booklet ‘Statistical formulae and tables’ is provided.
• – use this asfora guide
are 7 questions in this question paper. The total mark for this paper is 80.
The marks each question are shown in brackets
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
• Good luck with your examination.
answer and any working underneath.
Turn over
*P66656A0124*
P66656A
©2021 Pearson Education Ltd.
1/1/1/1/1/1/1/1/
, Answer ALL questions. Write your answers in the spaces provided.
1 Ramon is conducting a research project.
He has taken a random sample of 16 pairs of values for (x, y).
He has then calculated, from his data, a sample Pearson’s product moment correlation
coefficient of 0.716
Ramon believes that this calculated figure indicates that the population Pearson’s
product moment correlation coefficient is significantly different from zero.
(a) Conduct a hypothesis test to investigate Ramon’s belief.
(4)
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2
, Question 1 continued
Ramon has also produced a scatter graph from his data, shown in Figure 1.
Ramon’s scatter graph
100.0
90.0
80.0
70.0
y 60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0
x
Figure 1
(b) With reference to the scatter graph, explain why the conclusion made from the
hypothesis test conducted in (a) may not be valid.
(2)
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(Total for Question 1 is 6 marks)
3
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel
Level 3 GCE
Time 2 hours
Paper
reference 9ST0/02
Statistics
Advanced
PAPER 2: Statistical Inference
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,
• clearly
centre number and candidate number.
Answer all questions and ensure that your answers to parts of questions are
• Answer
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
• Unless
significant figures.
otherwise stated, statistical tests should be carried out at the
5% significance level.
Information
•• AThere
booklet ‘Statistical formulae and tables’ is provided.
• – use this asfora guide
are 7 questions in this question paper. The total mark for this paper is 80.
The marks each question are shown in brackets
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
• Good luck with your examination.
answer and any working underneath.
Turn over
*P66656A0124*
P66656A
©2021 Pearson Education Ltd.
1/1/1/1/1/1/1/1/
, Answer ALL questions. Write your answers in the spaces provided.
1 Ramon is conducting a research project.
He has taken a random sample of 16 pairs of values for (x, y).
He has then calculated, from his data, a sample Pearson’s product moment correlation
coefficient of 0.716
Ramon believes that this calculated figure indicates that the population Pearson’s
product moment correlation coefficient is significantly different from zero.
(a) Conduct a hypothesis test to investigate Ramon’s belief.
(4)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
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_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
2
, Question 1 continued
Ramon has also produced a scatter graph from his data, shown in Figure 1.
Ramon’s scatter graph
100.0
90.0
80.0
70.0
y 60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0
x
Figure 1
(b) With reference to the scatter graph, explain why the conclusion made from the
hypothesis test conducted in (a) may not be valid.
(2)
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_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
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(Total for Question 1 is 6 marks)
3
