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If variables have zero correlation, they do not have a linear relationship. Zero correlation shows that two things were not found to be related.
Cousins.
They can but the two are related when both are zero. Otherwise, it is like your weight and height having the same value (in some units).They can but the two are related when both are zero. Otherwise, it is like your weight and height having the same value (in some units).They can but the two are related when both are zero. Otherwise, it is like your weight and height having the same value (in some units).They can but the two are related when both are zero. Otherwise, it is like your weight and height having the same value (in some units).
The sum will be zero or close to zero, depending on how the sampling was done. See related question.
Only one of them is significant. The leading zero (zero to the left) is not significant. The trailing zero (rightmost) is significant. To recap, only the zero following the seven is significant. See the related links for a really good article on significant digits.