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Date None Specimen Marks available 1 Reference code SPNone.1.sl.TZ0.2
Level SL only Paper 1 Time zone TZ0
Command term Question number 2 Adapted from N/A

Question

There are nine books on a shelf. For each book, x is the number of pages, and y is the selling price in pounds (£). Let r be the correlation coefficient.

Write down the possible minimum and maximum values of r .

[2]
a.

Given that \(r = 0.95\) , which of the following diagrams best represents the data.


[1]
b.

For the data in diagram D , which two of the following expressions describe the correlation between x and y ?

perfect, zero, linear, strong positive, strong negative, weak positive, weak negative

[2]
c.

Markscheme

min value of r is \( - 1\), max value of r is 1     A1A1    N2

[2 marks]

a.

C     A1     N1

[1 mark]

b.

linear, strong negative     A1A1     N2

[2 marks]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 5 - Statistics and probability » 5.4 » Pearson’s product–moment correlation coefficient \(r\).

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