Dear forum pal, Here is my problem: - We would like to buid an experiment in order to check the effect of a new energy drink that is destined to the olympic sprinters (100m). - Here are our requirements for the experiment. - Type I error = alpha = less than 0.05 - Power = 1-beta = better than 0.80 If the results difference over 100 meter between someone who used the drink and someone who did not is 0.1%, what is the required sampling size ? Same question for a difference of 0.2 %, 2.5%, 3.6%, 4.0% and 4.7% Please try to help us. If our question lacks any other information please let me know. Pistone.