Tina starts off her persuasion speech with the following, "from my audience analysis, i know everyone in this room has had someone they loved affected by cancer. i want to propose a way of working together to eradicate this horrible disease." what has she done?

I and thou dialogic communication  is established

Explanation:

I and thou(You) concept of communication is defined by Martin Buber as the I-It and I-thou where I-It is referred with sensation and experiencing of world and I-thou is referred with relations of the world. Together it is determined as the interpersonal relation which cannot get modified due to any obstruction.

According to the situation described in question,Tina has established i-Thou concept of communication through dialog among the audience. She is using the pattern of I and you concept for defining the direct relation by communicating with audience and letting them know about affect of cancer on everyone's loved ones and ways of eliminating it.

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )