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The short answer is  yes.  The correlation is 61% which means the strength of the association is high (anything greater than 50%).  A correlation (good high level article here) goes from -1 to 1.   There are other factors to consider.  Inventory on the ground has a linear relationship with advertising expense, and although we are talking about engagement not traffic consider the cumulative effect marketing has on a customer reengaging on a website.  Not all marketing drives subsequent sessions and more engagement but it definitely helps!