Your Practice Paper – Applications and Interpretation SL for IBDP Mathematics
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Bivariate Analysis
� Correlations :
Positive
Strong 0.75 �r
� 1
Moderate 0.5 �r
� 0.75
Weak 0 �r
� 0.5
No r � 0
Negative
Weak �0.5 � r � 0
Moderate �0.75 � r � � 0.5
where r is the correlation coefficient
Strong �1� r � � 0.75
� Correlation Coefficient for ranked data :
r s
: Spearman ’ s Rank Correlation Coefficient
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Statistical Tests
� Hypothesis test : H
0
: Null hypothesis
H
1: Alternative hypothesis
C : Critical value in the hypothesis test
� : Significance level
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