Do experienced computer game players earn higher scores when they play with someone present to cheer them on or when they play alone? 50 teenagers who are experienced at playing a particular computer game have volunteered for a study. We randomly assigned 25 of them to play the game alone and the other 25 to play the game with a supporter present. Each player score is recorded.

(a) is this a problem about comparing means or comparing proportions? explain.


(b) what type of stuff we design is being used to produce data?