Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-IAL-S1-CR-0012 marksL1 FoundationCalculatorS values

For the same

8

pairs,

\sum y=120

and

\sum xy=760

. Find

S_{xy}

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-0051 markL1 FoundationCalculatorPMCC

Data are coded using

c=\dfrac{x-100}{10}

and

d=y-5

. The PMCC between

c

and

d

0.82

. What is the PMCC between

x

and

y

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-0071 markL1 FoundationCalculatorPMCC

The PMCC between the age of a car and its value is

-0.92

. This shows

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR1-0012 marksL1 FoundationNon-calculatorS values

For

10

values,

\sum y=50

and

\sum y^2=290

. Find

S_{yy}

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR1-0022 marksL1 FoundationNon-calculatorPMCC

For a set of bivariate data,

S_{xx}=16

S_{yy}=25

and

S_{xy}=12

. Find the PMCC.

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR1-0031 markL1 FoundationCalculatorPMCC

The PMCC between two variables is

-0.1

. This shows

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR1-0042 marksL1 FoundationNon-calculatorS values

For

5

pairs of values,

\sum x=15

\sum y=30

and

\sum xy=100

. Find

S_{xy}

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-G012 marksL1 FoundationCalculatorS values

For

8

pairs of values,

\sum x=48

and

\sum x^2=320

. Find

S_{xx}

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-Q011 markL1 FoundationCalculatorPMCC

Which value cannot be a product moment correlation coefficient?

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-0023 marksL2 StandardCalculatorPMCC

For

8

pairs of values,

S_{xx}=32

S_{xy}=40

\sum y=120

and

\sum y^2=1910

. Find the product moment correlation coefficient, to 3 significant figures.

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR1-0051 markL2 StandardCalculatorPMCC

For a group of children, shoe size and reading score have

r=0.9

. The best explanation is that

Salam Academy Original Practice · Proposed mark scheme

SA-IAL-S1-CR-0103 marksL4 ChallengingCalculatorPMCC

For a set of bivariate data,

S_{xx}=50

S_{xy}=40

and the PMCC is

0.8

. Find

S_{yy}

Salam Academy Original Practice · Proposed mark scheme