We do not have the interview statistics, however regardless of the numbers we recommend you approach the interview in the same manner. Whether the school's acceptance rate of applicants interviewed is 15% or 75%, you should put your best effort forward.
Here is a URL with interview tips: http://www.stacyblackman.com/tag/interviews/
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap