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What must be true of the two values in each pair of paired data?
A
They are recorded for the same individual, object or occasion.
B
The PMCC is r=SxySxxSyy\boxed{r=\frac{S_{xy}}{\sqrt{S_{xx}S_{yy}}}}r=SxxSyySxy.
C
When all xxx-values or all yyy-values are identical, making the denominator zero.
D
The deviations from both means tend to have the same sign.
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2.5.6 Pearson's product-moment correlation coefficient Flashcards
20 flashcards on OCR A Level Maths 2.5.6 Pearson's product-moment correlation coefficient: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.