How will marketers change their social media use in the near future? A survey by Social Media Examiner reported that 76% of B2B marketers (marketers that focus primarily on attracting businesses) plan to increase their use of Linkedln, as compared to 55% of B2C marketers (marketers that primarily target consumers). The survey was based on 1,945 B2B marketers and 1,868 B2C marketers. The following table summarizes the results:

a. Suppose you know that the marketer is a B2B marketer. What is the probability that he or she plans to increase use of Linkedln?
b. Suppose you know that the marketer is a B2C marketer. What is the probability that he or she plans to increase use of Linkedln?
c. Are the two events, increase use of Linkedln and business focus, independent? Explain.

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INCREASE USE OF LINKEDIN? Yes No BUSINESS FOCUS B2B B2C Total 1,478 1027 2.505 841 1.308 1.945 1.868 3,813 0 467 Total