FAQ: Statistical Thinking - Variable Relationships

This community-built FAQ covers the “Variable Relationships” exercise from the lesson “Statistical Thinking”.

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FAQs on the exercise Variable Relationships

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One thing I don’t understand is that in the learning environment, a correlation coefficient of 0 is considered a weak correlation, while 0.5 and -0.5 are unlabelled.

I was wondering why 0 would be considered weak rather than no correlation entirely, and why 0.5 and -0.5 are not labelled as weak.

Most likely a mistake - if you search more on this topic online, it is consistent that 0 means NO Correlation, and between 0.25 to 0.5 is considered a weak correlation. I would say anything below 0.25 is much too weak to be able to say there is a correlation at all.


The text says “The farther the coefficient is from 0, the stronger the relationship.” For some reason, my brain found it easier to think of it as "the closer it is to +1 (positive coefficient) or -1 (negative coefficient) the stronger the correlation. However, is that thinking flawed?

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