Medical Statistics at a Glance
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Wiley-Blackwell

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Chapter 26, Question 1.
Pearson's correlation coefficient

Select all of the following statements which you believe to be true. The Pearson correlation coefficient between two variables, x and y:

Is always positive.
Is dimensionless.
Takes the same value when the variables x and y are interchanged.
Takes the value zero when there is no linear association between the two variables x and y.
Takes the value + 1 when one variable increases as the other variable decreases in value, and it is possible to draw a straight line on the scatter diagram with all the points lying on it.