What social media tools do marketers commonly use? Social Media Examiner surveyed B2B and B2C marketers who commonly use an indicated social media tool. (B2B marketers are marketers that focus primarily on attracting businesses. B2C marketers are marketers that primarily target consumers.) Suppose the survey was based on 500 B2B marketers and 500 B2C marketers and yielded the results in the following table. (Data extracted from 2014 Social Media Marketing Industry Report, available from socialmediaexaminer.com.)

For each social media tool, at the 0.05 level of significance, determine whether there is a difference between B2B marketers and B2C marketers in the proportion who used each social media tool.

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SOCIAL MEDIA TOOL Facebook Twitter Linkedln You Tube BUSINESS FOCUS B2B 89% 86% 88% 52% B20 97% 81% 59% 60%