Thank you all for your comments.
I have done some magic before in front of friends and family but never in front of a large group of people. I know some simple card tricks but my favourite is a longer more complex card trick which includes sliding a card back in the deck as to use the card next instead. In this way I confuse the audience into thinking that I have used the previous card . I then get my volunteer to hold the deck of cards in between their knuckles. As I have made it so that their card is the bottom card. I flick off the other cards which then gives the illusion that the cad left in their hand happens to be their card.
I found the awareness test very much so demonstrating misdirection and selective attention so I think I might use it and explain how it works. I also found the magic article by Peter Lamont and Richard wiseman really interesting . Thank you very much.
I also watched the paper ball trick and found it extremely funny. I understand that it will be hard to pull off but I think I might try it. Also,I think the way the magician uses misdirection is very clear .
Thank you for all your help.
Mary