4 ms·
It depends on how much variance you normally have, and the size of the change you hope to measure. http://en.wikipedia.org/wiki/Statistical_power http://en.wik
by LargeWu 15y ago
It depends on how much variance you normally have, and the size of the change you hope to measure.
http://en.wikipedia.org/wiki/Statistical_power http://en.wikipedia.org/wiki/Statistical_power