Why is it possible to define the probability of committing a Type I error but impossible to know the probability of committing a Type II error? Which one is a worse error to commit? Explain why you...

Why is it possible to define the probability of committing a Type I error but impossible to know the probability of committing a Type II error? Which one is a worse error to commit? Explain why you think that (hint: there is no “right” answer, you get marks for arguing your side convincingly).