Presentations - Changing Image

I have 2 questions I like some feedback on I'm doing some research and would like your imput.

1. Can a presenter really change his/her image from presentation to presentation? If so, how? Is it ethical?


2.can u Think of a situation you have encountered or have heard of in which there were in-groups and out-groups (previous/current workplace, high school, etc.).

Describe a few of the groups
What traits account for the groups falling into each category?
What types of influences did those groups have on their members?