A survey designer could ask the same question in different ways, or ask questions with mutually exclusive answers, and then throw away responses with contradictory answers. (This isn’t a perfect cure but it can give an idea of which survey responses are just random marks and which aren’t.)
A survey designer could ask the same question in different ways, or ask questions with mutually exclusive answers, and then throw away responses with contradictory answers. (This isn’t a perfect cure but it can give an idea of which survey responses are just random marks and which aren’t.)