Retweet Probability for Tweets with Links

Data

1. From an analysis of millions of tweets, Dan Zarrella, who blogs about social media metrics found the following.

56.7% of Retweets have links in them
only 19% of tweets that aren't retweeted have links in them

That is prevalence of link among RTs is three times as high as that among non-RTs.

From this, what can we conclude? (I will provide the answer and solution at the end of this) *This question is required.

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