Since July 2015, Stone Temple has followed more than 1.4 M questions, keeping a track of the exact number which have results based on Knowledge Graph, featured snippets and improved snippets regularly in search results. Stone Temple used the same questions for all their studies.
All these questions were chosen since it seemed that they could be answered either through a featured snippet or a Knowledge Graph result. All the questions looked for a plain answer based on facts. There are a number of terms which you will have to understand before you go through the data. Some of them are mentioned below-