I have performed a pilot study comparing the means of two groups and I've yielded non-significant results. I wish to determine whether increasing the sample size would have produced a significant difference. My means and SD are:
Group 1: mean = 0.086 SD = 0.05524 ( n = 5) Group 2: mean = 0.0926 SD - 0.0509 (n=4)
What is the best formula to use to consider what sample sizes would render these results significant?