Question 8:
8 | (i) | y(cid:32)157x(cid:16)988 | B1
B1
[2] | 1.1
3.3 | n
Either coefficient correct to 3 s.f.
All correct including letters | BC
(cid:62)y(cid:32)157.11x(cid:16)988.15(cid:64)
8 | (ii) | No; r is unaffected by linear coding | E1
[1] | 2.3 | e
mNeeds both “no” and “linear”
seen, and no wrong or irrelevant
statements
8 | (iii) | (a) | H :(cid:85)(cid:32)0
0
H :(cid:85)(cid:122)0 where (cid:85) is the population correlation
1
coefficient
CV0.5494
p
0.9586(cid:33)0.5494
S
Reject H
0
Significant evidence of correlation between
consumption of mozzarella cheese and number of
civil engineering doctorates awarded. | cB2
e
B1
M1
M1
A1
[6] | i
1.1
2.5
3.4
1.1
1.1
2.2b | Hypotheses correctly stated
B1 if no symbol used
Correct critical value seen
Explicit comparison
Correct first conclusion
Contextualised, acknowledge
uncertainty
8 | (iii) | (b) | No, correlation does not imply causality | E1
[1] | 3.5b | Or: “there may be another factor
that influences both”
PPMMTT
Y532 Mark Scheme June 20XX
Assessment Objectives (AO) Grid
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M = Modelling
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PPMMTT
Y532 Mark Scheme June 20XX
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PPMMTT
AS Level Further Mathematics A
Y532 Statistics
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