This is generally good advice, but isn't it inappropriate in this specific instance?
The lady's claim was (allegedly) that she has a perfect ability to distinguish between the tea-milk orders, so in that case even a single failure is indeed enough to reject her claim.
We can't rule out her success rate being significantly greater than 50-50, but even a single failure puts some bounds on her maximum success rate.
The lady's claim was (allegedly) that she has a perfect ability to distinguish between the tea-milk orders, so in that case even a single failure is indeed enough to reject her claim.
We can't rule out her success rate being significantly greater than 50-50, but even a single failure puts some bounds on her maximum success rate.