Accelerometer Help?

Dsgkid595

Ok so I am making an app which involves flicking the iphone forward. Now I'm only asking the question because I haven't found any discussion relating the the sensitivity of the Z value for the accelerometer. So I need a value for the accelerometer.Z so that while people are tapping on the screen (part of the game), they don't accidentally change the attribute that disables their tapping, but I don't want people to have to throw their phones at the wall to get the game to work. What do you guys think?

Thanks in advance.