5% is level of significance and 95% is confidence.
Basically if they ask for a 95% confidence interval then do an interval. With 5%, they usually ask you to do a hypothesis test. Just do what's said on the question, they mean the same.
Unless you mean to 5% confidence in which case you do the same as 95% with using the number for 5% in the z-value thing in your log tables book but that's not on the course.