Question

Which of these correlation numbers shows the strongest relationship?

Answer 1

See below

Explanation:

I would say `-0.68`, but still `-0.68` does not indicate a strong correlation.
Keep in mind that any numbers that are between -0.5 and -0.7 show weak negative correlation only, same for positive.

The other numbers given in the question indicate very weak correlation.

See my table below.

The size of `r` indicates the strength of the correlation.

I hope this helps.