Under what circumstances can a very small treatment effect be statistically significant?
The ideal in sampling is to have as big a sample as possible and as small a variance as possible. The idea being that if you observe more and everything you observe is practically the same then you can be pretty darn sure of the population value.
Intra-uterine device(IUD) to prevent the fertilised egg from implanting itself in the uterine wall.
You can breathe through your mouth because your pharynx opens up to two cavities -- your nasal cavity (nose/nostrils) and your oral cavity (mouth).
The correct answer is: A. testosterone
