User blog comment:Kitahara/Recording drum expedition success rates/@comment-25779449-20150129053933

Thx for updating and the link. I saw you had #21 (3 sparkled) completed with 100 trials. As you may be probably interested, my calculation puts error around 7.8% with 90% confidence. While it is a good sample to give a rough estimate, if you'd like to make it as accurate like whether they're +10%, +12% or +16% for each sparkled ship, a larger sample (170~246) is recommended.

Anyway, there's really no forcing on that. Your efforts are appreciated