In this graph, how strong (if any) is the correlation? The image is from a presentation of another speaker (source: http://imgur.com/SBU4bUY).
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To answer this question we need to extract numbers with some plot digitizer and then compute correlation coefficient. I've used Engauge Digitizer and get answer r=-0.43. Such value is treated as moderate correlation in social sciences and as low correlation in nature sciences.