Please check my work as I have to use this information to run a factorial design experiment. I think my answer is incorrect. In a factorial design of four factors with two levels each with a =0.236 minutes, use Wheeler's Shortcut Formula for Determining the Number of Replicates:

N = ((8)/) 2

Determine how many experiments you will need to perform in order to have a power of 0.95 for detecting effects of size =0.50 minutes. For example, would this answer change if you decided to only experiment with three of the four factors? My answers:

N = (16/) ² = ((16)(0.236)/0.50) ² = 57.032

N = (8/) ² = ((8)(0.236)/0.50) ² = 14.258 If my answer is correct, will that mean I have to run 57 repetitions of all 16-factor combinations?