How to do hypothesis test with highly right skewed data that contains many zeros?
The data we got is "defect count on substract", and let's say we implemant a new clean method, and want to know if the new method is better than the original method, that is, we want to perform a hypothesis test to judge it.But the problem is: for both sample set, the major number is zero, and right skewed to several defect count, in this case is there any good method to perform hypothesis test? ...