When you don't know how to interpret the tables and analysis. All of the above. Interpretation is something we can all do. Interpretation is common-sensical. Interpretation requires a solid understanding of the mathematics involved.
Interpretation confuses people.
Interpretation requires you to do some essay writing. Answer in 25 words or less. Answer in 25 words or less. Criticizing a work as being too distant from academically accepted authorities. Gaining some objectivity so that you can make evaluations and decisions with less emotion.