Atest to detect an infection gives a positive result 98% of the time if a person is infected. it is 97% accurate for people who are not infected. % of results will be false negatives, and % of results will be false positives.

Consider this:

If a test gives a positive result for an infected person 98% of the time, that means that 2% of the time, it gives a negative result for an infected person, which would be a false negative.

Then,

if the test is 97& accurate (not precise) for non-infected people, that means that it gives a negative result 97& of the time. So a positive result will be given 3% of the time for non-infected people, which is considered a false positive.