Pearson Edexcel Level 3 GCE 9ST0/02 Statistics Advanced PAPER 2: Statistical Inference QP JUNE 2024

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 12 June 2024
Afternoon (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 answer and
any working underneath.
Turn over


P75705RA
©2024 Pearson Education Ltd.
F:1/1/1/1/1/1/1/1/1/1/
*P75705RA0124*

, Answer ALL questions. Write your answers in the spaces provided.

1 Brenda is a yoga teacher. She is researching the benefits of regular yoga practice on




DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
reducing eye fatigue.
To carry out her research, Brenda seeks 12 volunteer students, who have never practised
yoga before, to join her yoga classes.
She asks each student to complete a questionnaire before they start her classes.
In her questionnaire, the first question is as follows.

Indicate below your current level of eye fatigue by placing a cross on the line.
A score of 0 indicates no eye fatigue and a score of 10 indicates severe eye fatigue.


0 1 2 3 4 5 6 7 8 9 10


After attending her classes for three months, these 12 students are asked again to
complete the same questionnaire.
Both scores for the first question, for each of these 12 students, are given in Figure 1


Student A B C D E F G H I J K L

Score before yoga 7.4 6.2 8.8 3.5 5.4 6.3 9.5 4.4 6.3 7.8 3.6 5.0

Score after yoga 4.3 5.0 4.7 3.5 6.7 4.5 5.0 6.2 3.5 2.4 4.8 4.5


Figure 1

Brenda believes that regular yoga practice can reduce the average eye fatigue score.
(a) Making any necessary assumptions, carry out a paired t-test to investigate whether
there is evidence to support Brenda’s belief.
(7)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________

2
*P75705RA0224* 

, Question 1 continued
_____________________________________________________________________________________
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA




_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________

(b) Give two possible sources of bias in this experiment.
(2)
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
(Total for Question 1 is 9 marks)



3



 *P75705RA0324* Turn over