A level Statistics Paper 2 MARK SCHEME - Maths
[Pages:5]Question 1
A level Statistics Paper 2 MARK SCHEME
Question 2
Question 3
Question 4
Question 5
Pearson
Q5
Scheme
Marks
AOs
Progression Step and Progress
descriptor
a r = 0.171
A1
b The data shows a very weak positive correlation, almost no
A1
correlation as it is closer to zero so a linear model may not be
best
There may be other variables affecting the relationship or a
A1
different model might be a better fit
c
log n = 0.7606 + 0.0635t
c = 100.7606+0.0635t
c = 5.76 ?1.16t (3 s.f.)
M1 1.1a
6th
M1 1.1b Understand
A1 1.1b
exponential models in
bivariate data.
(3)
d a is a constant of proportionality.
A1 3.2a
6th
Understand exponential models in bivariate data.
(1)
e Extrapolation/out of the range of the data.
A1 2.4
4th
Understand the concepts of
interpolation and extrapolation.
(1)
(8 marks)
Question 6 Q6
Scheme
Pearson
Marks
AOs
Progression Step and Progress
descriptor
a The type and strength of linear correlation between two vriables A1
b 0.935
A1
c
H0 : = 0 , H1 : > 0
M1 1.1a
6th
Critical value = 0.4973
Reject H0 : there is reason to believe that students who do well in english test are likely to do well in mathematics tets
M1 1.1b Understand
A1 1.1b
exponential models in
bivariate data.
(3)
d There is a probability of 0.05 that the null hypothesis is true
A1 3.2a
6th
Understand exponential models in bivariate data.
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