In the beginning of his speech, ryan asked the audience a rhetorical question. at the end of the speech, he provided an answer to the question. which method for creating effective introductions did ryan use?

Ryan used a method called Hypophora. This resource consists of asking a question, with the aims to create interest and inquisitiveness among the audience and, by the end, explaining or giving the answer to that question.  

This resource is not a rhetorical question because the narrator or speaker does provide the answer, in contrast with rhetorical figure where the answer is implicit.  

the atm that sounds like it should be the answer

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 : )