 Edexcel AS Level 2022 PAPER 21: Statistics

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Pearson Edexcel Level 3 GCE
Paper
reference 8MA0/21
 
Mathematics
Advanced Subsidiary
PAPER 21: Statistics

You must have: Total Marks
Mathematical Formulae and Statistical Tables (Green), calculator


Candidates may use any calculator permitted by Pearson regulations.
Calculators must not have the facility for symbolic algebra manipulation,
differentiation and integration, or have retrievable mathematical
formulae stored in them.
Instructions
•• IfUsepencil
black ink or ball-point pen.
is used for diagrams/sketches/graphs it must be dark (HB or B).
• centre number
Fill in the boxes at the top of this page with your name,
and candidate number.
• clearly labelled. and ensure that your answers to parts of questions are
Answer all questions

• 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.
• Values from statistical tables should be quoted in full. If a calculator is used instead
of tables the value should be given to an equivalent degree of accuracy.
• Inexact answers should be given to three significant figures unless otherwise stated.
Information
•• AThebooklet ‘Mathematical Formulae and Statistical Tables’ is provided.
total mark for this part of the examination is 30. There are 5 questions.
• –Theusemarks for each question are shown in brackets
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.
Try to answer every question.
• Check your answers if you have time at the end. Turn over



*P69599A0112*
P69599A
©2022 Pearson Education Ltd.

Q:1/1/1/

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1. The relationship between two variables p and t is modelled by the regression line with
equation

p = 22 – 1.1 t

The model is based on observations of the independent variable, t, between 1 and 10
(a) Describe the correlation between p and t implied by this model.
(1)
Given that p is measured in centimetres and t is measured in days,
(b) state the units of the gradient of the regression line.
(1)
Using the model,
(c) calculate the change in p over a 3‑day period.
(2)
Tisam uses this model to estimate the value of p when t = 19
(d) Comment, giving a reason, on the reliability of this estimate.
(1)
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2
*P69599A0212* 