A study that is able to detect a relative risk of 2.0 between an exposure and an outcome 4 times out of 5 has:

Question

Quizplus · Accepted Answer

The power of a study tells us how likely it is that a study will detect an
association if it truly exists, in this case it would detect it 4 out 5 times = 80% of the time.
The probability of making a Type I error (C) or alpha level (B) tells us how likely it is that
we would see an association of a given magnitude if there were really no association.If
the power is 80%, the probability of making a type II error (wrongly concluding there is
no association) is only 20% which is not very high (D).

A Study That Is Able to Detect a Relative Risk