This activity could be used at anytime during the school year, but would probably work best at the beginning of the course when discussing scientific method, statistics, surveys, and the like.
The directions for the game can be found on Scott's website at http://hhspsychology.com/Documents/hi-low.doc or downloaded from the 4Shared file sharing account (look for "Scott Reed's Hi-Low Game.doc") at http://www.4shared.com/dir/10555367/29577282/sharing.html
The one major challenge of this activity is keeping the survey statistics up-to-date. If anyone has found books similar to those Scott uses or a website containing similar information, please leave a note in the comments section of this posting.
Thanks to Scott for his willingness to share this activity.