Problem: I have two sample groups(A and B), each with more than 30 samples. I want to know if the mean of A is 5% more than mean of B. Is z test a proper way to go here?
Online I found most of z test is testing hypothesis that if mean of A and B are different or not at confidence level of say 95%, but not testing if they are different for more than x%. Could anyone suggest a way here? Thanks a lot!