In addition to what the person has already said: An "obvious" effect is harder to spot than you think. Asking for statistical power to spot an effect in a wee

In addition to what the person has already said: An "obvious" effect is harder to spot than you think. Asking for statistical power to spot an effect in a week when you're trying a dozen compounds at once-- you'd need millions enrolled in this study, and they'd need to be very patient.