Well if you're happy with 95% certainty, good luck to you. I look for rather better than that. Perhaps 5 sigma is overkill, but I'd be a lot happier with 99% certainty.
Anyway, I'm now tired of this topic, so I'm out.
Lettuce now hear about inventive ways you have killed them
Chemical warfare ?
Fairy Liquid ?
Slice in two carefully ?
Re-enactments of the Goldfinger-Bond-Laser scene? " No Mr.Bond. I don't want you to talk - I want you to die "
In the case of correctly identifying (in an ABX blind test) if there is an audible difference all it takes is someone getting it right eight times out of ten to be statistically significant:
http://www.madronadigital.com/Library/High Resolution Audio/Statistics of ABX Testing.html
The total comes to £9.50 inc postage (probably send them separately to avoid the jewel case breaking).
My emails from last time see to be missing. Can't remember how you paid last time. Was is a gift payment or bank transfer?
Will also need your postal address again.