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Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 2: Statistical Inference QP JUNE 2024
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Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 2: Statistical Inference QP JUNE 2024
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PAPER 2: Statistical Inference
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Pearson Edexcel Level 3 GCE Statistics Advanced PAPER 2: Statistical Inference QP JUNE 2024
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,
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centre number and candidate number.
all questions and ensure that your answers to parts of questions are
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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
• 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.
• The are 7 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.
•• Read
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each question carefully before you start to answer it.
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Try to answer every question.
your answers
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P75705RA
©2024 Pearson Education Ltd.
F:1/1/1/1/1/1/1/1/1/1/
, 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
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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
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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)
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2
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, Question 1 continued
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(b) Give two possible sources of bias in this experiment.
(2)
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(Total for Question 1 is 9 marks)
3
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