Power calculation for non-significant pilot study?

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?

• What statistical test did you use? This is important to determine the sample size. Given the observed mean difference and its variability, it is unfortunately no surprise to arrive at a non-significant result with these group sizes. – ocram Apr 14 '15 at 19:05
• Hi. I performed an unpaired t-test – Kim Apr 14 '15 at 19:07
• stats.stackexchange.com/questions/37993/… – ocram Apr 14 '15 at 19:10