OK, this is a challenge for many engineers. Here is how to solve the problem-- use engineering verbs in describing what it is that you have done. You designed, engineered, modelled, calculated, etc whatever it is that you are claiming credit for. In the quality control realm-- not knowing anymore than what is presented here, I posit that you did the following-- you collected and reviewed the data, which then required that you designed, calculated and modelled specific control charts, X bar charts, acceptance tables to identify the problem of why the project, line, process was out of control. Once you determined a root cause analysis, you then were able to design and calculate the necessary parameters to bring the process back into control. Now, you cannot use my words-- I don't know what you did, but you see how I drafted the answer to show the reviewer that you did do engineering. Give this a try-- always tell the truth-- never lie or tell a falsehood. This does work.