Apps. and Interpretation for IBDP Maths Ebook 1 | страница 315

Chapter
22
Bivariate Analysis
SUMMARY POINTs
�
Correlations:
Positive
Strong 0.75 �r
� 1
Moderate 0.5 �r
� 0.75
Weak 0 �r
� 0.5
No r � 0
22
Negative
Weak �0.5 � r � 0
Moderate �0.75 � r � � 0.5
Strong �1� r � � 0.75
where r is the correlation coefficient
�
Correlation Coefficient for ranked data:
r
s
: Spearman’s Rank Correlation Coefficient
Solutions of Chapter 22
305
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