Application of a statistical technique to determine significance...I think
April 22, 2007 5:31 PM Subscribe
[StatsFilter] Which statistical technique do I need and how do I use it?
posted by dendrite to Science & Nature (20 answers total)
Believe it or not, this is not a student's homework problem. I work in a biology lab and have made some observations. Now I need some stats to help me proceed. I'm just not sure which technique to use and how set up the correct formula. Alas, its been nearly a decade since my Intro to Statistics class. Online tutorials are short on example applications.
Here's what I got:
Of 635 cells in population A, 39 are "neato" positive. (That makes a 5.67% frequency I wish to assume for the below populations)
Of 109 cells in population B, 0 are "neato" positive.
Of 3 cells in population C, 0 are "neato" positive.
How significant is this zero result in population B? (i.e. how would I set up a formula to determine it's p-value? Or is there something else I need to do to determine significance?)
Lastly, the zero result in population C is obviously not very important in light of the extremely small sample size, how many more cells would I need to observe to make it significant considering the 5.67% frequency of population A?
Thanks MeFi! Answers are great, but so is pointing me in the right direction.