An auditor counted the number of filing errors associated with random samples of three types of mortgages at four banks. A filing error might, for instance, be a missing signature or incomplete...

An auditor counted the number of filing errors associated with random samples of three types of mortgages at four banks. A filing error might, for instance, be a missing signature or incomplete paperwork. The mortgage types are traditional, refinancing, and home equity loan. What would it mean to find an interaction between the type of loan and the bank?