Apps. and Interpretation for IBDP Maths Ebook 1 | Seite 390

Your Practice Set – Applications and Interpretation for IBDP Mathematics
93.2 (a) rs
� 0.867
(b) There is a strong agreement
between the two judges
93.3 (a) b � 2 , d � 3, f � 5 and
g � 4
(b) rs
� 0.905
(c) It is more likely for a team to
be at a higher position in the
league if it scores more goals
93.4 (a) rs
� 0.0857
(b) (i) a � 1, e � 5
(ii) Rs
� 0.9
(iii) The value of the
Spearman’s rank
correlation coefficient
increases
Exercise 94
94.1 (a) The values of the first
variable are not quantifiable
data
(b) rs
� 0.8
(c) It is more likely for a type of
ice cream to have a higher
ranking if its selling price is
higher
94.2 (a) The values of the data are not
linear
(b) rs
�� 0.833
(c) It is more likely to have a
lower score in Geography test
if the score in Chemistry test
is higher
94.3 (a) The positions of teams in the
league are not quantifiable
data
(b) p � 5.5 , q � 7
(c) rs
� 0.946
(d) 1, 2, 3, 4 and 5
94.4 (a) r � 0.814
(b) (i) b�a�
2
(ii) g �a�
3
(c) rs
� 0.893
(d) The rank of the score of the
diver B awarded by the
trainee judge is unchanged
Exercise 95
95.1 (a) (i) 0.860
(ii) a � 0.00360 ,
b �� 0.626
(b) 1.9 kg
(c) 2.41 kg
(d) 2019
95.2 (a) (i) 0.982
(ii) a � 2.5625 ,
b � 6.375
(b) 68 kg
(c) 91.0 kg
(d) February 2019
95.3 (a) (i) 0.982
(ii) a � 14.1 , b � 188
(b) 343
(c) 28.1
(d) 1984
95.4 (a) (i) � 0.926
(ii) a �� 1.17 , b � 58.8
(b) 45
(c) 0.0866
(d) After 7.29 minutes
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