Statistics Paper 1 Data and Probability 2020 Questions and Answers

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Centre Number Candidate Number
Pearson Edexcel
Level 3 GCE
Tuesday 16 June 2020
Afternoon (Time: 2 hours) Paper Reference 9ST0/01

Statistics
Advanced
Paper 1: Data and Probability

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.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• centre
Fill in the boxes at the top of this page with your name,
number and candidate number.
• labelled.all questions and ensure that your answers to parts of questions are clearly
Answer

• Answer the questions in the spaces provided
– there may be more space than you need.
• You should show sufficient working to make your methods clear.
Answers without working may not gain full credit.
• Unless 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.
are 9 questions in this question paper. The total mark for this paper is 80.
• – use this asfora guide
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.
Try to answer every question.
•• Check 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



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

1 Shenandoah works at a medical practice. She wants to find out about patients’ opinions




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on a planned extension to the practice and the disruption this may cause.
She plans to ask several questions to a sample of patients.
For each of the following methods, state one advantage, and two potential sources of bias.
(a) Method A: Give a questionnaire, to be filled out whilst waiting, to each patient in the
waiting room at the practice on a certain morning.
(i) one advantage
(1)
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(ii) two potential sources of bias




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(2)
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, Question 1 continued
(b) Method B: Number the list of all patients registered at the practice and use a simple random
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sample (without replacement) to select a sample of patients.
Email a link, to an online survey, to each of these patients.
(You may assume that all patients have given their permission to be contacted by email.)
(i) one advantage
(1)
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(ii) two potential sources of bias
(2)
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(Total for Question 1 is 6 marks)
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3
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